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[Co/Pd]-NiFe exchange springs with tunable magnetization tilt angle

Journal article
Authors T. N. Anh Nguyen
Yeyu Fang
Vahid Fallahi
Nadjib Benatmane
Seyed Majid Mohseni
Randy K. Dumas
Johan Åkerman
Published in Applied Physics Letters
Volume 98
Issue 17
ISSN 0003-6951
Publication year 2011
Published at Department of Physics (GU)
Language en
Keywords Magnetism, Spintronics, Tilted Anisotropy
Subject categories Magnetism


We investigate exchange coupled [Co/Pd]5–NiFe thin films. Due to competition between the in-plane shape anisotropy of the NiFe and strong perpendicular magnetic anisotropy of the [Co/Pd]5 multilayer, unique magnetic configurations are achievable. In particular, we explore the out-of-plane magnetization tilt angle of the NiFe layer. Experimental results, based on conventional magnetometry, ferromagnetic resonance, and magnetic force microscopy, agree well with one-dimensional micromagnetic simulations. We find that the tilt angle is highly tunable (0°–60°) over a small range of NiFe thicknesses (4.8–8 nm). Potential applications for high power, zero-field operation spin torque oscillators are discussed.

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