Abstract
We investigate crystalline structures of a permalloy nanowire subject to current pulses by using standard transmission and scanning electron microscope techniques, together with the analysis of magnetic states by means of Lorenz microscopy. We find that crystalline grains grow slightly larger in a current region around the Curie temperature, which does not affect significantly the uniformly-magnetized state in the wire because of strong uniaxial shape anisotropy given by the wire geometry. When crystalline grains grow large enough to additionally provide in-plane anisotropy comparable to the shape anisotropy by averaging crystalline anisotropy over the grains, the magnetic ripple will be induced in the wire. Such situations can be found in the case when very large current pulses are applied to the wire.
| Original language | English |
|---|---|
| Number of pages | 1 |
| Journal | Journal of Applied Physics |
| Volume | 107 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - May 1 2010 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
Cite this
Crystalline analysis of permalloy narrow wires subject to current pulses. / Togawa, Yoshihiko; Takayanagi, Kazuya; Kimura, Takashi; Harada, Ken; Akashi, Tetsuya; Tonomura, Akira; Mori, Shigeo; Otani, Yoshichika.
In: Journal of Applied Physics, Vol. 107, No. 9, 01.05.2010.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Crystalline analysis of permalloy narrow wires subject to current pulses
AU - Togawa, Yoshihiko
AU - Takayanagi, Kazuya
AU - Kimura, Takashi
AU - Harada, Ken
AU - Akashi, Tetsuya
AU - Tonomura, Akira
AU - Mori, Shigeo
AU - Otani, Yoshichika
PY - 2010/5/1
Y1 - 2010/5/1
N2 - We investigate crystalline structures of a permalloy nanowire subject to current pulses by using standard transmission and scanning electron microscope techniques, together with the analysis of magnetic states by means of Lorenz microscopy. We find that crystalline grains grow slightly larger in a current region around the Curie temperature, which does not affect significantly the uniformly-magnetized state in the wire because of strong uniaxial shape anisotropy given by the wire geometry. When crystalline grains grow large enough to additionally provide in-plane anisotropy comparable to the shape anisotropy by averaging crystalline anisotropy over the grains, the magnetic ripple will be induced in the wire. Such situations can be found in the case when very large current pulses are applied to the wire.
AB - We investigate crystalline structures of a permalloy nanowire subject to current pulses by using standard transmission and scanning electron microscope techniques, together with the analysis of magnetic states by means of Lorenz microscopy. We find that crystalline grains grow slightly larger in a current region around the Curie temperature, which does not affect significantly the uniformly-magnetized state in the wire because of strong uniaxial shape anisotropy given by the wire geometry. When crystalline grains grow large enough to additionally provide in-plane anisotropy comparable to the shape anisotropy by averaging crystalline anisotropy over the grains, the magnetic ripple will be induced in the wire. Such situations can be found in the case when very large current pulses are applied to the wire.
UR - http://www.scopus.com/inward/record.url?scp=79951611327&partnerID=8YFLogxK
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U2 - 10.1063/1.3356229
DO - 10.1063/1.3356229
M3 - Article
AN - SCOPUS:79951611327
VL - 107
JO - Journal of Applied Physics
JF - Journal of Applied Physics
SN - 0021-8979
IS - 9
ER -