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Multilevel Transitions of Closely Arranged Spin Valve Pillars Using Spin Transfer Switching

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7 Author(s)
Nobuhiko Funabashi ; Sci. & Tech. Res. Labs., Japan Broadcasting Corp., Tokyo ; Kenji Machida ; Ken-ichi Aoshima ; Yasuyoshi Miyamoto
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Two closely arranged spin valve pillars sharing a pair of top and bottom electrodes were fabricated and their spin transfer switching (STS) characteristics were investigated. Each pillar was a 300 times 100 nm rectangle, such that the distance d between two pillars was varied up to 1 mum . The STS curves of a single pillar and closely arranged pillars with the distance d of 1 mum showed single-step transitions, but the STS curves of closely arranged pillars with the distance d of 0.3 mum showed clear two-step transitions. We found that the plateau width of the intermediate resistive state of the two-step transitions can be controlled by the distance >d . The basis for this stable intermediate resistive state seemed to be magnetic interactions and the intrinsic switching mode of STS.

Published in:

IEEE Transactions on Magnetics  (Volume:44 ,  Issue: 11 )