Magnetomechanical Effects in the Elastic Polymer Composites Containing Ferromagnetic Powder Particles

In the present work, a detailed thermodynamic consideration for the magnetic free energy of the composite material consisting of the ferromagnetic powder particles embedded into a polymer matrix is given. We estimate their magnetostatic interaction energy and its dependence on the microscopic distri...

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Date:2018
Main Authors: Likhachev, A.A., Koval, Yu.N.
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Published: Інститут металофізики ім. Г.В. Курдюмова НАН України 2018
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Cite this:Magnetomechanical Effects in the Elastic Polymer Composites Containing Ferromagnetic Powder Particles / A.A. Likhachev, Yu.N. Koval // Металлофизика и новейшие технологии. — 2018. — Т. 40, № 9. — С. 1221-1230. — Бібліогр.: 13 назв. — англ.

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spelling nasplib_isofts_kiev_ua-123456789-1518622025-02-09T17:07:28Z Magnetomechanical Effects in the Elastic Polymer Composites Containing Ferromagnetic Powder Particles Магнитомеханические эффекты в упругих полимерных композитах с ферромагнитными порошковыми частицами Магнетомеханічні ефекти у пружніх полімерних композитах з феромагнетними порошковими частинками Likhachev, A.A. Koval, Yu.N. Электронные структура и свойства In the present work, a detailed thermodynamic consideration for the magnetic free energy of the composite material consisting of the ferromagnetic powder particles embedded into a polymer matrix is given. We estimate their magnetostatic interaction energy and its dependence on the microscopic distribution of the magnetization and the magnetic field in the composite material. We also define the hydrostatic component of the mechanical force developed in a composite and the volume change effect caused by the magnetostatic interactions in such composites. В данной работе даётся детальный термодинамический анализ магнитной свободной энергии композитного материала, который состоит из ферромагнитных порошковых частиц, внедрённых в упругую полимерную матрицу. Мы даём оценку их энергии магнитного взаимодействия и её зависимости от микроскопического распределения намагниченности и магнитного поля внутри композитного материала. Мы также определяем гидростатическую компоненту механических напряжений, которые развиваются в композите, и эффект изменения объёма, обусловленный магнитостатическими взаимодействиями порошковых частиц в таких композитах. В даній роботі дається детальна термодинамічна аналіза магнетної вільної енергії композитного матеріялу, що складається з феромагнетних порошкових частинок, втілених у пружню полімерну матрицю. Ми даємо оцінку їхньої енергії магнетної взаємодії та її залежність від мікроскопічного розподілу намагнетованости та магнетного поля всередині композитного матеріялу. Ми також визначаємо гідростатичну компоненту механічних напружень, що розвиваються у композиті, та ефект зміни об’єму, зумовлений магнетостатичною взаємодією порошкових частинок у таких композитах. 2018 Article Magnetomechanical Effects in the Elastic Polymer Composites Containing Ferromagnetic Powder Particles / A.A. Likhachev, Yu.N. Koval // Металлофизика и новейшие технологии. — 2018. — Т. 40, № 9. — С. 1221-1230. — Бібліогр.: 13 назв. — англ. 1024-1809 PACS: 61.50.Ks, 62.20.fg, 64.70.K-, 75.80.+q, 81.40.Jj, 82.35.Np, 83.60.Np DOI: 10.15407/mfint.40.09.1221 https://nasplib.isofts.kiev.ua/handle/123456789/151862 en Металлофизика и новейшие технологии application/pdf Інститут металофізики ім. Г.В. Курдюмова НАН України
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection DSpace DC
language English
topic Электронные структура и свойства
Электронные структура и свойства
spellingShingle Электронные структура и свойства
Электронные структура и свойства
Likhachev, A.A.
Koval, Yu.N.
Magnetomechanical Effects in the Elastic Polymer Composites Containing Ferromagnetic Powder Particles
Металлофизика и новейшие технологии
description In the present work, a detailed thermodynamic consideration for the magnetic free energy of the composite material consisting of the ferromagnetic powder particles embedded into a polymer matrix is given. We estimate their magnetostatic interaction energy and its dependence on the microscopic distribution of the magnetization and the magnetic field in the composite material. We also define the hydrostatic component of the mechanical force developed in a composite and the volume change effect caused by the magnetostatic interactions in such composites.
format Article
author Likhachev, A.A.
Koval, Yu.N.
author_facet Likhachev, A.A.
Koval, Yu.N.
author_sort Likhachev, A.A.
title Magnetomechanical Effects in the Elastic Polymer Composites Containing Ferromagnetic Powder Particles
title_short Magnetomechanical Effects in the Elastic Polymer Composites Containing Ferromagnetic Powder Particles
title_full Magnetomechanical Effects in the Elastic Polymer Composites Containing Ferromagnetic Powder Particles
title_fullStr Magnetomechanical Effects in the Elastic Polymer Composites Containing Ferromagnetic Powder Particles
title_full_unstemmed Magnetomechanical Effects in the Elastic Polymer Composites Containing Ferromagnetic Powder Particles
title_sort magnetomechanical effects in the elastic polymer composites containing ferromagnetic powder particles
publisher Інститут металофізики ім. Г.В. Курдюмова НАН України
publishDate 2018
topic_facet Электронные структура и свойства
url https://nasplib.isofts.kiev.ua/handle/123456789/151862
citation_txt Magnetomechanical Effects in the Elastic Polymer Composites Containing Ferromagnetic Powder Particles / A.A. Likhachev, Yu.N. Koval // Металлофизика и новейшие технологии. — 2018. — Т. 40, № 9. — С. 1221-1230. — Бібліогр.: 13 назв. — англ.
series Металлофизика и новейшие технологии
work_keys_str_mv AT likhachevaa magnetomechanicaleffectsintheelasticpolymercompositescontainingferromagneticpowderparticles
AT kovalyun magnetomechanicaleffectsintheelasticpolymercompositescontainingferromagneticpowderparticles
AT likhachevaa magnitomehaničeskieéffektyvuprugihpolimernyhkompozitahsferromagnitnymiporoškovymičasticami
AT kovalyun magnitomehaničeskieéffektyvuprugihpolimernyhkompozitahsferromagnitnymiporoškovymičasticami
AT likhachevaa magnetomehaníčníefektiupružníhpolímernihkompozitahzferomagnetnimiporoškovimičastinkami
AT kovalyun magnetomehaníčníefektiupružníhpolímernihkompozitahzferomagnetnimiporoškovimičastinkami
first_indexed 2025-11-28T09:43:58Z
last_indexed 2025-11-28T09:43:58Z
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fulltext PACS numbers: 61.50.Ks, 62.20.fg, 64.70.K-, 75.80.+q, 81.40.Jj, 82.35.Np, 83.60.Np Magnetomechanical Effects in the Elastic Polymer Composites Containing Ferromagnetic Powder Particles A. A. Likhachev and Yu. N. Koval G. V. Kurdyumov Institute for Metal Physics, N.A.S. of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine In the present work, a detailed thermodynamic consideration for the magnet- ic free energy of the composite material consisting of the ferromagnetic pow- der particles embedded into a polymer matrix is given. We estimate their magnetostatic interaction energy and its dependence on the microscopic dis- tribution of the magnetization and the magnetic field in the composite mate- rial. We also define the hydrostatic component of the mechanical force devel- oped in a composite and the volume change effect caused by the magnetostat- ic interactions in such composites. Key words: magnetomechanical effect, magnetostriction, elastic polymer, ferromagnetic powder, composite material. В даній роботі дається детальна термодинамічна аналіза магнетної вільної енергії композитного матеріялу, що складається з феромагнетних порош- кових частинок, втілених у пружню полімерну матрицю. Ми даємо оцін- ку їхньої енергії магнетної взаємодії та її залежність від мікроскопічного розподілу намагнетованости та магнетного поля всередині композитного матеріялу. Ми також визначаємо гідростатичну компоненту механічних напружень, що розвиваються у композиті, та ефект зміни об’єму, зумов- лений магнетостатичною взаємодією порошкових частинок у таких ком- позитах. Ключові слова: магнетомеханічний ефект, магнетострикція, пружні по- лімери, феромагнетні порошки, композитні матеріяли. Corresponding author: Alexander Anatolievich Likhachev E-mail: alexl@imp.kiev.ua Citation: A. A. Likhachev and Yu. N. Koval, Magnetomechanical Effects in the Elastic Polymer Composites Containing Ferromagnetic Powder Particles, Metallofiz. Noveishie Tekhnol., 40, No. 9: 1221–1230 (2018), DOI: 10.15407/mfint.40.09.1221. Ìåòàëëîôèç. íîâåéøèå òåõíîë. / Metallofiz. Noveishie Tekhnol. 2018, т. 40, № 9, сс. 1221–1230 / DOI: 10.15407/mfint.40.09.1221 Îттиски доступнû непосредственно от издателя Ôотокопирование разрешено только в соответствии с лицензией  2018 ÈМÔ (Èнститут металлофизики им. Ã. В. Êурдюмова ÍÀÍ Óкраинû) Íапечатано в Óкраине. 1221 mailto:gfirst@imp.kiev.ua https://doi.org/10.15407/mfint.40.09.1221 https://doi.org/10.15407/mfint.40.09.1221 1222 A. A. LIKHACHEV and Yu. N. KOVAL В данной работе даётся детальнûй термодинамический анализ магнитной свободной энергии композитного материала, которûй состоит из ферро- магнитнûх порошковûх частиц, внедрённûх в упругую полимерную мат- рицу. Мû даём оценку их энергии магнитного взаимодействия и её зави- симости от микроскопического распределения намагниченности и маг- нитного поля внутри композитного материала. Мû также определяем гидростатическую компоненту механических напряжений, которûе раз- виваются в композите, и эффект изменения объёма, обусловленнûй маг- нитостатическими взаимодействиями порошковûх частиц в таких ком- позитах. Ключевые слова: магнитомеханический эффект, магнитострикция, упругие полимерû, ферромагнитнûе порошки, композитнûе материалû. (Received June 17, 2018) 1. INTRODUCTION In the last years, the study of heterogeneous materials consisting of magnetic micro- and nanoparticles imbedded into a nonmagnetic ma- trix has been increasing due to its importance for understanding mi- cromagnetic interactions in these systems as well as for possible appli- cations [1, 2]. When the magnetic particles are magnetized and the ma- trix material is elastic, an elastic magnet is obtained. This material may exhibit elastomagnetic effects [3, 4], and it can be used for sensors and actuators [5, 6]. In order to have optimum performances for the mentioned applications, the material must have a high content of mag- netic particles. During these years, several different materials were tested: magne- toelastic composite with the filling particles made of magnetostrictive, hard or soft ferromagnetic material [7, 8]. Some possible applications in the airplane and car industries as actuators or antifriction compo- nents [9], heat-shrinkable elastic ferromagnets with the variable mag- netic and conductive properties [10] were discussed. Those papers were dealing with a similar kind of materials and focusing on the theoretical and experimental correlation of the material elasticity with its mag- netic behaviour. In particular, they analysed a composite of particles uniformly dis- persed inside the matrix material: a) the particles having an asymmet- ric shape, preferably with a main anisotropy axis; b) the particles, which were soft ferromagnetic or small permanent magnets; c) the composites having an elastic behaviour, due to the matrix properties, up to a relative deformation. In these conditions, a strong coupling acts between magnetization axis and the main shape anisotropy axis of the particles. Therefore, a change of the magnetizing field along an axis different from the easy magnetization one gives a rotation of the MAGNETOMECHANICAL EFFECTS IN THE ELASTIC POLYMER COMPOSITES 1223 particles due to the mechanical torque, in order to align the magnetic moments with the applied field [4]. The macroscopic effect of these lo- cal rotations can be a deformation of the whole material. The inverse effect [11] consists in the change of magnetization axis due to a defor- mation of the elastic material. As an example, an elongation of the elastomagnetic material produces a rotation of each particle and a con- sequent rotation of its magnetic moment because it is strongly coupled with the particles geometry. This also gives a variation of the magneti- zation component along the elongation axis. In conclusion, the inverse elastomagnetic effect can be used to have a strain sensor detecting de- formation by means of the induced magnetization changes at constant temperature and magnetizing field [3, 12, 13]. A general target of the present work is to produce a detailed ther- modynamic consideration for the magnetic free energy of the compo- site material consisting of the ferromagnetic powder particles embed- ded into a polymer matrix. We estimate their magnetostatic interac- tion energy and its dependence on the microscopic distribution of the magnetization and the magnetic field in the composite. We also define the hydrostatic component of the mechanical force and the volume change effect caused by the magnetostatic interactions in such compo- sites. 2. MAGNETIC FREE ENERGY, MAGNETIC FORCES, AND STRAIN EFFECT IN POLYMER COMPOSITES CONTAINING FERROMAGNETIC PARTICLES Generally, the magnetic forces can be produced in any ferromagnetic material when it magnetizes. Everything depends on the fact, if the material is deformable and if the magnetic free energy per unit volume Fmag(h, ε) is dependent not only on the external magnetic field h, but also on the strain of the material ε. Here, we have defined the magnetic free energy to be zero at h = 0. So, it represents only a magnetic part of the total free energy of the material F mag(h, ε) = F(0, ε) + F mag(h, ε). In such a case, both the macroscopic magnetization of the material m(h, ε) and the field-induced magnetic forces σmag(h, ε) can be represented on the basis of the general thermodynamic relationships as follows: mag mag mag mag( , ) ( , ) , ( , ) ( , ) .F F ∂ ∂   = − = −   ∂ ∂   h m h h h h h ε ε ε σ ε ε ε (1) In absence of the magnetic field, any deformable material can be strained elastically or unelastically applying the external mechanical load σ. In that case, the strain response of the material can be repre- sented by its zero-field stress–strain relationship σ = σ0(ε). In general case, when both the mechanical forces and the magnetic ones are ap- 1224 A. A. LIKHACHEV and Yu. N. KOVAL plied, they work altogether simultaneously, and a corresponding strain effect can be found from the following force balance equation: mag 0( , ) ( ).+ =hσ σ σ σ ε (2) So, in two partial cases σ = 0 and h = 0, we obtain very similar relation- ships: = =mag 0 0( , ) ( ) and ( ),hσ ε σ ε σ σ ε (3) where the first one defines implicitly the magnetic-field-induced strain (MFIS) effect in a particular ferromagnetic material, which is generally dependent both on its magnetic properties and also on the mechanical behaviour of the material represented by its zero-field strain–stress relationship σ = σ0(ε). For instance, in the ordinary mag- netostrictive materials, it is given by a well-known linear and com- pletely reversible Hook’s law. In other recently discovered large MFIS systems like ferromagnetic shape-memory NiMnGa alloy, the straining mechanism is not elastic and based on the field-induced twinning oc- curring in these systems. 3. HYDROSTATIC MAGNETIC FORCES AND VOLUME CHANGE IN POLYMER COMPOSITES CONTAINING FERROMAGNETIC PARTICLES Here, we will apply the previously discussed idea to understand what the hydrostatic magnetic forces can be developed in systems consisting of the multiple ferromagnetic particles imbedded into some elastically soft polymer matrix and what the volume changes can be expected in similar materials. For that, we introduce the total magnetic free energy F of such a composite system of a volume V and containing totally the volume Vm of all ferromagnetic particles randomly distributed in the polymer ma- trix. We also assume that the saturation magnetization Ms of the bulk ferromagnetic material per its unit volume is known and that the satu- ration magnetization of each particular is the same. In that case, F(V, Vm, h) can be represented in the following general form: ( , , ) , ( , ),m m m m V F V V h VF h VF z h V  = =    (4) where Fm(z, h) is the magnetic free energy per unit volume of the com- posite, h is the external magnetic field, and z = Vm/V is the volume fraction of the ferromagnetic material in the composite. This gives us MAGNETOMECHANICAL EFFECTS IN THE ELASTIC POLYMER COMPOSITES 1225 the possibility to define the hydrostatic pressure developed in a mag- netic field as follows: ( , ) , ( , ) ( , ) .m m m m m hh V P z h VF h F z h z F z h V V z  ∂ ∂   = = −    ∂ ∂    (5) We can also define the magnetization per unit volume of the composite material accordingly: ( )( , ) , ( , ) .m m m z V V M z h F h F z h h V h  ∂ ∂ = − = −  ∂ ∂   (6) 4. MAGNETOSTATIC ENERGY IN POLYMER COMPOSITES Generally, the total magnetic free energy of a composite material F containing N ferromagnetic particles magnetized to its full saturation consists of the Zeeman’s and magnetostatic (demagnetizing) energy contributions. It can be represented as follows: 1 1 . 2 N P P P P P F v =  = − +    ∑ hm h m (7) Here, vP are the particle volumes, mP = Mseh—their local magnetiza- tions all fully magnetized parallel to the external magnetic field h, and hP is the local demagnetizing field averaged over the particle volume. The local demagnetizing field is produced by the surface magnetic charges induced both at the external surface of the composite material and at the particle interface, where normal magnetization components have jumps. Therefore, it can be written in the following manner: 4 4 ( ),P P P= − π − π −h Dm D m m (8) where mP = Mseh, m is the macroscopic magnetization of the fully satu- rated composite material: 1 1 1 , . N N P P s h m P P P v zM V v V = = = = =∑ ∑m m e (9) Here, D, DP are the demagnetizing matrices representing both the composite material and the ferromagnetic particle dependent only on their shapes. So, finally, for the magnetic free energy per unit volume of the composite material, we obtain: 2 21 ( , ) 4 ( ( ) )( ) . 2m P P s sF z h D z D D z M zM h= π + − − (10) 1226 A. A. LIKHACHEV and Yu. N. KOVAL Here, D, PD are the components of the demagnetizing matrices par- allel to the external magnetic field applied. It is important that PD is defined as the average demagnetizing factor of the ferromagnetic par- ticle system: 1 1 1 , . N N P P P m P P Pm D v D V v V = = = =∑ ∑ (11) In particular, it means that, if all the particles are randomly oriented, then their average demagnetizing factor must be equal PD = 1/3 even if all of them are not really the spherical ones. In other words, the fer- romagnetic material distribution in the polymer matrix is statistically isotropic in this case. Using Eqs. (5) and (10), one can also obtain the magnetic pressure: 2 21 ( , ) 4 ( ) . 2 P sP z h D D z M= − π − (12) The corresponding calculation results are represented in Fig. 1. As follows from these results, the maximal magnetic force, which is achieved in the completely saturated composite samples with the ran- domly oriented particles, is strongly dependent on the volume fraction of the ferromagnetic material and the demagnetizing factor of the composite samples. It may have different signs as the demagnetizing Fig. 1. Dependence of the magnetic pressure developed in a fully saturated composite containing the randomly oriented ferromagnetic particles at the different demagnetizing factors D of the composite samples. MAGNETOMECHANICAL EFFECTS IN THE ELASTIC POLYMER COMPOSITES 1227 factor changes within the range 0 < D < 1. In case D = 0 (the sample is a long cylinder parallel to the magnetic field), the magnetic force will produce a compression effect. In the other case D = 1 (the sample is a thin plate aligned perpendicular to the magnetic field), the magnetic force will cause an extension. A general characteristic scale of the magnetic forces is defined by the material constant P0 = 2π(Ms) 2 pro- portional to the saturation magnetization squared. 5. STRAIN EFFECT PRODUCED BY MAGNETIC FORCES As follows from Eq. (3), the relative volume change must be propor- tional to the magnetic force developed in a composite material and re- verse proportional to its effective bulk elastic modulus C(z). 1 vol ( , ) ( ) ( , ), ( ) ( ( )) . V z h K z P z h K z C z V −δ = ε = = (13) Here, K(z) is obviously a bulk elastic compressibility of the composite material. As follows from the mechanical testing experiments shown in Fig. 2, the elastic moduli of the polymer composites containing the rigid powder particles are strongly dependent on its volume fraction. These results indicate that the bulk elastic modulus is sharply goes up as the volume fraction of rigid particles increases so as the com- pressibility decreases approximately linearly. Therefore, for some practical reasons, we can use a following simple linear model for the Fig. 2. Fraction dependence of bulk elastic modulus and elastic compressibil- ity. 1228 A. A. LIKHACHEV and Yu. N. KOVAL elastic compressibility: 0( ) (1 ).K z K z= − (14) It means that only the compressibility of polymer matrix K0 gives a contribution into K(z) proportional to its volume fraction (1 − z). So, finally, we obtain the field induced volume effect: 2 2 0( , ) 2 ( ) ( ) (1 ).vol s Pz h K M D D z zε = − π − − (15) It is strongly dependent on both the sample and ferromagnetic parti- cle shapes represented by the difference between their demagnetizing factors. It is also strongly dependent on the volume fraction of ferro- magnetic material. The general scale of the field-induced effects is de- fined by the material constant proportional to the elastic compressibility of the polymer and squared saturation magnetization of bulk ferromag- netic material. The fraction dependent factor has a maximum at the vol- ume fraction at about z = 2/3. These final results are shown in Fig. 3. 6. CONCLUSIONS The magnetic free energy of the composite material consists of the magnetostatic energy of separate ferromagnetic powder particles, their magnetostatic interaction energy, and the Zeeman’s energy. It is strongly dependent on the volume fraction of magnetic powder and the Fig. 3. Elastomagnetic volume change effect and its dependence on the volume fraction of ferromagnetic powder and demagnetizing factor of the composite sample. MAGNETOMECHANICAL EFFECTS IN THE ELASTIC POLYMER COMPOSITES 1229 magnetic field applied. Both the macroscopic magnetization and the hydrostatic magnetic forces can be obtained from the magnetic free energy as functions of the volume fraction and the magnetic field applied by using the general differential thermodynamic relationships. The micromagnetic model of the polymer composite consisting of the ferromagnetic powders and elastically soft polymer matrix devel- oped here has given the expression for the magnetostatic energy and the magnetic forces as functions of the volume fraction, magnetic field and the macroscopic demagnetizing factors of the composite samples. It has given a possibility to estimate the maximal field induced strain effect and its dependence on the volume fraction of the ferromagnetic material. The experimental study of the elastic moduli of the polymer compo- sites containing the different volume fraction of powder particles has shown its strong dependence on the volume fraction of powder. One can use these results to estimate the fraction dependence of the field induced strain effect, its dependence on the volume fraction of the fer- romagnetic material, and its maximal value. Finally, we have concluded that the field induced volume effect is strongly dependent on the sample and ferromagnetic-particle shapes represented by the difference between their demagnetizing factors. It is also strongly dependent on the volume fraction of ferromagnetic ma- terial. The general scale of the field-induced effects is defined by the material constant proportional to the elastic compressibility of the polymer and squared saturation magnetization of bulk ferromagnetic material. The fraction dependent factor has a maximum at the volume fraction at about z = 2/3. This work has been supported by Science Technology Centre of Ukraine (Project No. 5522). REFERENCES 1. A. A. Novakova, V. Yu. Lanchinskaya, A. V. Volkov, T. S. Gendler, T. Yu. Kiseleva, M. A. Moskvina, and S. B. Zezin, J. Magn. 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Zallen, The Physics of Amorphous Solids (New York: Wiley: 1983), Ch. 5, p. 223. https://doi.org/10.1063/1.373133 https://doi.org/10.1016/S0142-9418(02)00043-0 https://doi.org/10.1016/S0921-5107(00)00482-7 https://doi.org/10.1103/PhysRevB.63.054438 << /ASCII85EncodePages false /AllowTransparency false /AutoPositionEPSFiles true /AutoRotatePages /None /Binding /Left /CalGrayProfile (Dot Gain 20%) /CalRGBProfile (sRGB IEC61966-2.1) /CalCMYKProfile (U.S. Web Coated \050SWOP\051 v2) /sRGBProfile (sRGB IEC61966-2.1) /CannotEmbedFontPolicy /Error /CompatibilityLevel 1.4 /CompressObjects /Tags /CompressPages true /ConvertImagesToIndexed true /PassThroughJPEGImages true /CreateJobTicket false /DefaultRenderingIntent /Default /DetectBlends true /DetectCurves 0.0000 /ColorConversionStrategy /CMYK /DoThumbnails false /EmbedAllFonts true /EmbedOpenType false /ParseICCProfilesInComments true /EmbedJobOptions true /DSCReportingLevel 0 /EmitDSCWarnings false /EndPage -1 /ImageMemory 1048576 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