Andreev-reflection spectroscopy of ferromagnets: the impact of Fermi surface mismatch
We have investigated point contacts between a superconductor (Nb, AuIn2) and a normal metal (ferromagnetic Co, nonmagnetic Cu). The observed Andreev-reflection spectra were analyzed using the modified BTK theory including spin polarization effects. This resulted in a polarization of Co that agrees w...
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| Veröffentlicht in: | Физика низких температур |
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| Datum: | 2011 |
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| Sprache: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2011
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| Online Zugang: | https://nasplib.isofts.kiev.ua/handle/123456789/118600 |
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| Zitieren: | Andreev-reflection spectroscopy of ferromagnets: the impact of Fermi surface mismatch / E. Tuuli, K. Gloos // Физика низких температур. — 2011. — Т. 37, № 6. — С. 609–613. — Бібліогр.: 29 назв. — англ. |
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Tuuli, E. Gloos, K. 2017-05-30T17:05:10Z 2017-05-30T17:05:10Z 2011 Andreev-reflection spectroscopy of ferromagnets: the impact of Fermi surface mismatch / E. Tuuli, K. Gloos // Физика низких температур. — 2011. — Т. 37, № 6. — С. 609–613. — Бібліогр.: 29 назв. — англ. 0132-6414 PACS: 74.45.+c, 72.25.Mk, 73.40.–c, 85.30.Hi https://nasplib.isofts.kiev.ua/handle/123456789/118600 We have investigated point contacts between a superconductor (Nb, AuIn2) and a normal metal (ferromagnetic Co, nonmagnetic Cu). The observed Andreev-reflection spectra were analyzed using the modified BTK theory including spin polarization effects. This resulted in a polarization of Co that agrees with observations by others, but lifetime effects describe the spectra equally well. On the other hand, the spectra with nonmagnetic Cu can be well described using the spin-polarization model. The ambiguity between polarization and lifetime interpretation poses a dilemma which can be resolved by considering the normal reflection at those interfaces due to Fermi surface mismatch. Our data suggest that Andreev reflection at Nb–Co contacts does deliver the true magnetic polarization of Co only when lifetime effects and the mentioned intrinsic normal reflection are included. We thank the Jenny and Antti Wihuri Foundation for financial support. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Электронные свойства проводящих систем Andreev-reflection spectroscopy of ferromagnets: the impact of Fermi surface mismatch Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Andreev-reflection spectroscopy of ferromagnets: the impact of Fermi surface mismatch |
| spellingShingle |
Andreev-reflection spectroscopy of ferromagnets: the impact of Fermi surface mismatch Tuuli, E. Gloos, K. Электронные свойства проводящих систем |
| title_short |
Andreev-reflection spectroscopy of ferromagnets: the impact of Fermi surface mismatch |
| title_full |
Andreev-reflection spectroscopy of ferromagnets: the impact of Fermi surface mismatch |
| title_fullStr |
Andreev-reflection spectroscopy of ferromagnets: the impact of Fermi surface mismatch |
| title_full_unstemmed |
Andreev-reflection spectroscopy of ferromagnets: the impact of Fermi surface mismatch |
| title_sort |
andreev-reflection spectroscopy of ferromagnets: the impact of fermi surface mismatch |
| author |
Tuuli, E. Gloos, K. |
| author_facet |
Tuuli, E. Gloos, K. |
| topic |
Электронные свойства проводящих систем |
| topic_facet |
Электронные свойства проводящих систем |
| publishDate |
2011 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| description |
We have investigated point contacts between a superconductor (Nb, AuIn2) and a normal metal (ferromagnetic Co, nonmagnetic Cu). The observed Andreev-reflection spectra were analyzed using the modified BTK theory including spin polarization effects. This resulted in a polarization of Co that agrees with observations by others, but lifetime effects describe the spectra equally well. On the other hand, the spectra with nonmagnetic Cu can be well described using the spin-polarization model. The ambiguity between polarization and lifetime interpretation poses a dilemma which can be resolved by considering the normal reflection at those interfaces due to Fermi surface mismatch. Our data suggest that Andreev reflection at Nb–Co contacts does deliver the true magnetic polarization of Co only when lifetime effects and the mentioned intrinsic normal reflection are included.
|
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/118600 |
| citation_txt |
Andreev-reflection spectroscopy of ferromagnets: the impact of Fermi surface mismatch / E. Tuuli, K. Gloos // Физика низких температур. — 2011. — Т. 37, № 6. — С. 609–613. — Бібліогр.: 29 назв. — англ. |
| work_keys_str_mv |
AT tuulie andreevreflectionspectroscopyofferromagnetstheimpactoffermisurfacemismatch AT gloosk andreevreflectionspectroscopyofferromagnetstheimpactoffermisurfacemismatch |
| first_indexed |
2025-11-29T07:03:47Z |
| last_indexed |
2025-11-29T07:03:47Z |
| _version_ |
1850854621675782144 |