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Magnetic Field Dependence of Energy Barrier of Perpendicular Nanomagnet

Authors
Song, KyungmiLee, Sung ChulLee, Kyung-Jin
Issue Date
11월-2014
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords
Energy barrier; perpendicular nanomagnet; spin-transfer torque magnetic random access memory (STT-MRAM)
Citation
IEEE TRANSACTIONS ON MAGNETICS, v.50, no.11
Indexed
SCIE
SCOPUS
Journal Title
IEEE TRANSACTIONS ON MAGNETICS
Volume
50
Number
11
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/96946
DOI
10.1109/TMAG.2014.2321581
ISSN
0018-9464
Abstract
Based on the nudged elastic band model, we investigate the thermal energy barrier and its field dependence of a circular-shaped perpendicular nanomagnet for various exchange constants and cell sizes. We find that the energy barrier depends not only on the cell size but also on the exchange stiffness constant when the switching is governed by the domain-wall nucleation and propagation. We show that analyzing the switching probability curve based on the field-dependent energy barrier equation for the single-domain switching can underestimate the energy barrier so that one has to use the correct field dependence of energy barrier, which can be obtained numerically.
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