Perpendicular magnetic anisotropy in Co-Pt granular multilayers

被引：0

作者：

Bartolomé, J. ^{[1
]}

Figueroa, A.I. ^{[1
]}

García, L.M. ^{[1
]}

Bartolomé, F. ^{[1
]}

Ruiz, L. ^{[2
]}

González-Calbet, J.M. ^{[2
]}

Petroff, F. ^{[3
,4
]}

Deranlot, C. ^{[3
,4
]}

Wilhelm, F. ^{[5
]}

Rogalev, A. ^{[5
]}

Brookes, N. ^{[5
]}

机构：

[1] Instituto de Ciencia de Materiales de Aragón, Departamento de Física, Materia Condensada CSIC/U de Zaragoza, Zaragoza, Spain

[2] Departamento de Química Inorgánica, Universidad Complutense de Madrid, E-28040 Madrid, Spain

[3] Unité Mixte de Physique, CNRS/Thales, Route Départementale 128, 91767 Palaiseau Cedex, France

[4] Université Paris-Sud, 91405 Orsay (Paris), France

[5] European Synchrotron Radiation Facility, BP220, F-38043, Grenoble, France

来源：

Fizika Nizkikh Temperatur | 2012年 / 38卷 / 09期

关键词：

Cobalt - Alumina - Binary alloys - Magnetic anisotropy - Magnetic moments - Platinum alloys - Multilayer films - Embedded systems - Temperature - Aluminum oxide - Magnetization - Cobalt alloys;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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 μ0H C = 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.

引用

页码：1053 / 1057