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Report No.
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Evaluation of edge domains in giant magnetoresistive junctions

Frost, W.*; Seki, Takeshi*; Kubota, Takahide*; Ramos, R.*; Saito, Eiji; Takanashi, Koki*; Hirohata, Atsufumi*

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 Fe$$_2$$O$$_3$$ on the sides of the GMR pillar. This generates a spin wave in Fe$$_2$$O$$_3$$, which couples with the free-layer edge magnetization and controls the reversal of the ferromagnetic layers in one direction only, increasing the current density from $$(1.1pm0.1)times10^7$$ A/cm$$^2$$ to $$(7.0pm0.5)times10^7$$ A/cm$$^2$$. By simple assumption, we estimate the effect of the edge domain on magnetization reversal to be $$10%-15%$$ by spin-transfer torque.

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Category:Physics, Applied

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