Magnetization Reversal by Field and Current Pulses in Elliptic CoFeB/MgO Tunnel Junctions with Perpendicular Easy Axis

Eriko Hirayama; Hideo Sato; Shun Kanai; Fumihiro Matsukura; Hideo Ohno

doi:10.1109/LMAG.2016.2568163

Magnetization Reversal by Field and Current Pulses in Elliptic CoFeB/MgO Tunnel Junctions with Perpendicular Easy Axis

Eriko Hirayama, Hideo Sato, Shun Kanai, Fumihiro Matsukura, Hideo Ohno

Tohoku University

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

We fabricate elliptic CoFeB/MgO magnetic tunnel junctions (MTJs) with perpendicular magnetic easy axis with different in-plane aspect ratios (ARs) from 1 to 4 with the same area as that of a 100 nm diameter circular MTJ. We evaluate their thermal stability factors from magnetization switching probability measurements by using either applied magnetic field pulses or current pulses. The thermal stability factors determined from field-pulse measurement appear to decrease with increasing AR, whereas those from current-pulse measurement depend much less on AR. These results imply that the different drives induce switching through different magnetization reversal modes.

Original language	English
Article number	7469308
Journal	IEEE Magnetics Letters
Volume	7
DOIs	https://doi.org/10.1109/LMAG.2016.2568163
Publication status	Published - 2016

Keywords

magnetization reversal
perpendicular magnetic anisotropy
Spin electronics

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10.1109/LMAG.2016.2568163

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abstract = "We fabricate elliptic CoFeB/MgO magnetic tunnel junctions (MTJs) with perpendicular magnetic easy axis with different in-plane aspect ratios (ARs) from 1 to 4 with the same area as that of a 100 nm diameter circular MTJ. We evaluate their thermal stability factors from magnetization switching probability measurements by using either applied magnetic field pulses or current pulses. The thermal stability factors determined from field-pulse measurement appear to decrease with increasing AR, whereas those from current-pulse measurement depend much less on AR. These results imply that the different drives induce switching through different magnetization reversal modes.",

keywords = "magnetization reversal, perpendicular magnetic anisotropy, Spin electronics",

author = "Eriko Hirayama and Hideo Sato and Shun Kanai and Fumihiro Matsukura and Hideo Ohno",

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T1 - Magnetization Reversal by Field and Current Pulses in Elliptic CoFeB/MgO Tunnel Junctions with Perpendicular Easy Axis

AU - Hirayama, Eriko

AU - Sato, Hideo

AU - Kanai, Shun

AU - Matsukura, Fumihiro

AU - Ohno, Hideo

PY - 2016

Y1 - 2016

N2 - We fabricate elliptic CoFeB/MgO magnetic tunnel junctions (MTJs) with perpendicular magnetic easy axis with different in-plane aspect ratios (ARs) from 1 to 4 with the same area as that of a 100 nm diameter circular MTJ. We evaluate their thermal stability factors from magnetization switching probability measurements by using either applied magnetic field pulses or current pulses. The thermal stability factors determined from field-pulse measurement appear to decrease with increasing AR, whereas those from current-pulse measurement depend much less on AR. These results imply that the different drives induce switching through different magnetization reversal modes.

AB - We fabricate elliptic CoFeB/MgO magnetic tunnel junctions (MTJs) with perpendicular magnetic easy axis with different in-plane aspect ratios (ARs) from 1 to 4 with the same area as that of a 100 nm diameter circular MTJ. We evaluate their thermal stability factors from magnetization switching probability measurements by using either applied magnetic field pulses or current pulses. The thermal stability factors determined from field-pulse measurement appear to decrease with increasing AR, whereas those from current-pulse measurement depend much less on AR. These results imply that the different drives induce switching through different magnetization reversal modes.

KW - magnetization reversal

KW - perpendicular magnetic anisotropy

KW - Spin electronics

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Magnetization Reversal by Field and Current Pulses in Elliptic CoFeB/MgO Tunnel Junctions with Perpendicular Easy Axis

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