Electric current effect on the energy barrier of magnetic domain wall depinning: origin of the quadratic contribution.
Phys Rev Lett
; 107(21): 217205, 2011 Nov 18.
Article
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| MEDLINE
| ID: mdl-22181920
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.
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Base de datos:
MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2011
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Article