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Depth-Dependent Magnetization Profiles of Hybrid Exchange Springs

Journal article
Authors T. N. A. Nguyen
R. Knut
V. Fallahi
Sunjae Chung
Q. T. Le
S. M. Mohseni
O. Karis
S. Peredkov
Randy K. Dumas
C. W. Miller
Johan Åkerman
Published in Physical Review Applied
Volume 2
Issue 4
Pages artikel nr 044014
ISSN 2331-7019
Publication year 2014
Published at Department of Physics (GU)
Pages artikel nr 044014
Language en
Links dx.doi.org/10.1103/PhysRevApplied.2...
Keywords RAY CIRCULAR-DICHROISM, SPIN-TORQUE OSCILLATOR, MICROSCOPIC ORIGIN, PERPENDICULAR-ANISOTROPY, NI/PT MULTILAYERS, TRANSITION-METALS, NANO-OSCILLATORS, ORBITAL-MOMENT, DATA-STORAGE, DRIVEN, Physics, Applied, OHR J, 1995, PHYSICAL REVIEW LETTERS, V75, P3748
Subject categories Physical Sciences

Abstract

We report on the magnetization depth profile of a hybrid exchange-spring system in which a Co/Pd multilayer with perpendicular anisotropy is coupled to a CoFeB thin film with in-plane anisotropy. The competition between these two orthogonal anisotropies promotes a strong depth dependence of the magnetization orientation. The angle of the magnetization vector is sensitive both to the strength of the individual anisotropies and to the local exchange constant and is thus tunable by changing the thickness of the CoFeB layer and by substituting Ni for Pd in one layer of the Co/Pd stack. The resulting magnetic depth profiles are directly probed by element-specific x-ray magnetic circular dichroism of the Fe and Ni layers located at different average depths. The experimental results are corroborated by micromagnetic simulations.

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