Electric field control of magnetic anisotropy and model for oriented Co/graphene design

Cheng Hsun Tony Chang, Yu Ting Chow, Pei Cheng Jiang, Ting Xun Yang, Jyh Shen Tsay*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Electric field controlled magnetic devices have attracted interest in the area of magnetic recording research, owing to their lower power consumption and high stability. While heterostructures composed of Co and carbon materials exhibit unique properties, our understanding of the magnetic properties of Co on graphene with a wavelike structure and related electric field-controlled phenomena remains limited. Here, we demonstrate the preparation of a customized Co/graphene structure, in which the controllability of the coercive force is enhanced. Taking the coercive force and geometric factor of Co into consideration, a shape-dependent magnetic anisotropy is proposed, which sufficiently explains the correlation between the coercive force and the aspect ratios of the Co stripes. For the magnetic field perpendicular to the bottom lines of canyons, the adjustment capability of the coercive force is enhanced under conditions of a more negatively charged surface. Based on the large electric field and related magnetic anisotropy energy, a ferro-ionic control (FeIC) model is proposed, which describes the relationship between the electric potential and coercive force in electrified conditions. Based on a FeIC model with a preferred orientation, we propose a design of an integrated FeIC inductor with field tunability that could strongly impact the field of integrated-circuit design, resulting in wider applications and functionalities of chips.

Original languageEnglish
Article number092412
JournalApplied Physics Letters
Volume124
Issue number9
DOIs
Publication statusPublished - 2024 Feb 26

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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