Electric Current Effect on the Energy Barrier of Magnetic Domain Wall Depinning: Origin of the Quadratic Contribution
- Electric Current Effect on the Energy Barrier of Magnetic Domain Wall Depinning: Origin of the Quadratic Contribution
- 김갑진; 류지수; 김기홍; 이재철; 신경호; 이현우; 최석봉
- Issue Date
- Physical review letters
- VOL 107, NO 21, 217205-1-217205-5
- 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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