Perpendicular magnetic anisotropy in Co-Pt granular multilayers

Автор(и)

  • J. Bartolomé Instituto de Ciencia de Materiales de Aragón, Departamento de Física de la Materia Condensada CSIC/U de Zaragoza, Zaragoza, Spain
  • A. Rogalev European Synchrotron Radiation Facility, BP220, F-38043, Grenoble, France
  • F. Wilhelm European Synchrotron Radiation Facility, BP220, F-38043, Grenoble, France
  • C. Deranlot Unité Mixte de Physique, CNRS/Thales, Route Départementale 128, 91767 Palaiseau Cedex, France, and Université Paris-Sud, 91405 Orsay (Paris), France
  • F. Petroff Unité Mixte de Physique, CNRS/Thales, Route Départementale 128, 91767 Palaiseau Cedex, France, and Université Paris-Sud, 91405 Orsay (Paris), France
  • J.M. González-Calbet Departamento de Química Inorgánica, Universidad Complutense de Madrid, E-28040 Madrid, Spain
  • L. Ruiz Departamento de Química Inorgánica, Universidad Complutense de Madrid, E-28040 Madrid, Spain
  • F. Bartolomé Instituto de Ciencia de Materiales de Aragón, Departamento de Física de la Materia Condensada CSIC/U de Zaragoza, Zaragoza, Spain
  • L.M. García Instituto de Ciencia de Materiales de Aragón, Departamento de Física de la Materia Condensada CSIC/U de Zaragoza, Zaragoza, Spain
  • A.I. Figueroa Instituto de Ciencia de Materiales de Aragón, Departamento de Física de la Materia Condensada CSIC/U de Zaragoza, Zaragoza, Spain
  • N. Brookes European Synchrotron Radiation Facility, BP220, F-38043, Grenoble, France

DOI:

https://doi.org/10.1063/1.4752096

Ключові слова:

magnetic thin films, magnetic multilayers, perpendicular magnetic anisotropy, platinum alloys, granular materials.

Анотація

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.

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Опубліковано

2012-07-16

Як цитувати

(1)
Bartolomé, J.; Rogalev, A.; Wilhelm, F.; Deranlot, C.; Petroff, F.; González-Calbet, J.; Ruiz, L.; Bartolomé, F.; García, L.; Figueroa, A.; Brookes, N. Perpendicular Magnetic Anisotropy in Co-Pt Granular Multilayers. Fiz. Nizk. Temp. 2012, 38, 1053-1057.

Номер

Том 38 № 9 (2012)

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