Electric current effect on the energy barrier of magnetic domain wall depinning: origin of the quadratic contribution |
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Authors: | Kim Kab-Jin Ryu Jisu Gim Gi-Hong Lee Jae-Chul Shin Kyung-Ho Lee Hyun-Woo Choe Sug-Bong |
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Institution: | CSO and Department of Physics, Seoul National University, Republic of Korea. |
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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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