Abstract
Layer-selective manipulation of the magnetization direction in a multilayer magnetic structure offers a way to develop a large-capacity magnetic recording device with multiple recording layers. Here, we use a double-layer perpendicular magnetic nanodot consisting of two layers with low and high perpendicular magnetic anisotropy (PMA) and show that layer-selective magnetization switching can be accomplished by utilizing a microwave-assisted magnetization switching technique. Since the low- and high-PMA magnetic layers have different ferromagnetic resonance frequencies, their magnetization excitation that reduces the switching field can be individually induced by adjusting the frequency of the applied microwave field (), and this principle allows to select the layer to be switched. In addition, by measuring thermally excited ferromagnetic-resonance signals from the nanodot, we find that the magnetization dynamics of the two PMA layers couple through interactions, and we identify the excitation modes responsible for the layer-selective magnetization switching.
- Received 9 August 2015
DOI:https://doi.org/10.1103/PhysRevApplied.5.014003
© 2016 American Physical Society
Physics Subject Headings (PhySH)
Synopsis
Magnetizing the Third Dimension
Published 12 January 2016
A magnetic structure that stores bits of information on multiple layers could lead to three-dimensional magnetic recording schemes.
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