Evaluation of Edge Domains in Giant Magnetoresistive Junctions

William James Frost; Takeshi Seki; Takahide Kubota; Rafael Ramos; Eiji Saitoh; Koki Takanashi; Atsufumi Hirohata

doi:10.1063/5.0049315

Evaluation of Edge Domains in Giant Magnetoresistive Junctions

William James Frost, Takeshi Seki, Takahide Kubota, Rafael Ramos, Eiji Saitoh, Koki Takanashi, Atsufumi Hirohata

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

Abstract

We demonstrate that the spin-Seebeck effect can be used to estimate the volume of edge domains formed in a giant magnetoresistive (GMR) device. The thermal gradient induced by Joule heating can be harnessed by the addition of a ferromagnetically insulating channel of Fe2O3 on the sides of the GMR pillar. This generates a spin wave in the Fe2O3 which couples with the free-layer edge magnetisation and controls the reversal of the ferromagnetic layers in one direction only, increasing current density from (1.1±0.1)x107 A/cm2 to (7.0±0.5)x107 A/cm2. By simple assumption, we estimate the effect of the edge domain on magnetisation reversal to be (10-15)% by spin-transfer torque.

Original language	English
Article number	172405
Number of pages	5
Journal	Applied Physics Letters
Volume	118
Issue number	17
Early online date	26 Apr 2021
DOIs	https://doi.org/10.1063/5.0049315
Publication status	E-pub ahead of print - 26 Apr 2021

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This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

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Cite this

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abstract = "We demonstrate that the spin-Seebeck effect can be used to estimate the volume of edge domains formed in a giant magnetoresistive (GMR) device. The thermal gradient induced by Joule heating can be harnessed by the addition of a ferromagnetically insulating channel of Fe2O3 on the sides of the GMR pillar. This generates a spin wave in the Fe2O3 which couples with the free-layer edge magnetisation and controls the reversal of the ferromagnetic layers in one direction only, increasing current density from (1.1±0.1)x107 A/cm2 to (7.0±0.5)x107 A/cm2. By simple assumption, we estimate the effect of the edge domain on magnetisation reversal to be (10-15)% by spin-transfer torque.",

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AU - Kubota, Takahide

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AU - Takanashi, Koki

AU - Hirohata, Atsufumi

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