Perpendicular magnetic anisotropy in Co–Pt granular multilayers

• Published in: Физика низких температур
• Date: 2012
• Main Authors: Bartolomé, J., Figueroa, A.I., García, L.M., Bartolomé, F., Ruiz, L., González-Calbet, J.M., Petroff, F., Deranlot, C., Wilhelm, F., Rogalev, A., Brookes, N.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2012
• Subjects: К 80-летию Виктора Валентиновича Еременко
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/117613
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Perpendicular magnetic anisotropy in Co–Pt granular
 multilayers / J. Bartolomé, A.I. Figueroa, L.M. García, F. Bartolomé, L. Ruiz, J.M. González-Calbet, F. Petroff, C. Deranlot, F. Wilhelm, A. Rogalev, N. Brookes // Физика низких температур. — 2012. — Т. 38, № 9. — С. 1053-1057. — Бібліогр.: 15 назв. — англ.

Magnetization hysteresis curves have been measured on Co granular multilayers, (Al₂O₃/Co/Pt)N (N = 1 and
 25), with the applied magnetic field parallel and perpendicular to the substrate plane. In all samples perpendicular
 magnetic anisotropy was observed. For Co particles with average diameter 3 nm, the coercive field at low
 temperature is μ₀HC = 0.5 T. HC decreases for increasing temperature and disappears at ≈200 K. A soft magnetic
 component is also present in all samples up to the freezing temperature Tf = 365 K. Co and Pt XMCD measurements
 at the L2,3 edges were performed, yielding to the orbital mL and spin mS contributions to the total magnetic
 moment of the system. These results, in addition to XANES ones, indicate the presence of CoxPt₁₋x alloy. Particles
 conformed of CoPt alloy, embedded in Pt and coupled magnetically by dipolar or RKKY interaction, may
 explain the phenomenology observed in these systems.