Electric Current Effect on the Energy Barrier of Magnetic Domain Wall Depinning: Origin of the Quadratic Contribution

Title
Electric Current Effect on the Energy Barrier of Magnetic Domain Wall Depinning: Origin of the Quadratic Contribution
Authors
김갑진류지수김기홍이재철신경호이현우최석봉
Issue Date
2011-11
Publisher
Physical review letters
Citation
VOL 107, NO 21, 217205-1-217205-5
Abstract
The energy barrier of a magnetic domain wall trapped at a defect is measured experimentally. When the domain wall is pushed by an electric current and/or a magnetic field, the depinning time from the barrier exhibits perfect exponential distribution, indicating that a single energy barrier governs the depinning. The electric current is found to generate linear and quadratic contributions to the energy barrier, which are attributed to the nonadiabatic and adiabatic spin-transfer torques, respectively. The adiabatic spin-transfer torque reduces the energy barrier and, consequently, causes depinning at lower current densities, promising a way toward low-power current-controlled magnetic applications.
URI
http://pubs.kist.re.kr/handle/201004/41042
ISSN
0031-9007
Appears in Collections:
KIST Publication > Article
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