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Spin-transfer-torque-induced zero-field microwave oscillator using a magnetic easy cone state
Peong-Hwa Jang,Seo-Won Lee,Kyung-Jin Lee 한국물리학회 2016 Current Applied Physics Vol.16 No.12
Current-induced spin-transfer torque can induce magnetization precession in gigahertz ranges, which enables various microwave devices. In most cases, this current-induced precession requires an additional external magnetic field, which is detrimental for device applications. In this work, we show that the current-induced precession is realized even without an external field when the magnetic layer has conical magnetization, caused by the second order easy-axis magnetic anisotropy. We theoretically derive the oscillation frequency and output power and confirm their validity by macrospin simulations. We find that the ratio of the second to the first anisotropy constants is key to determine the maximum frequency and power. Our results will be helpful for the applications of microwave devices utilizing spintransfer torques and provide a design rule of such devices.
Spin-transfer-torque-induced zero-field microwave oscillator using a magnetic easy cone state
Jang, Peong-Hwa,Lee, Seo-Won,Lee, Kyung-Jin ELSEVIER 2016 CURRENT APPLIED PHYSICS Vol.16 No.12
<P>Current-induced spin-transfer torque can induce magnetization precession in gigahertz ranges, which enables various microwave devices. In most cases, this current-induced precession requires an additional external magnetic field, which is detrimental for device applications. In this work, we show that the current-induced precession is realized even without an external field when the magnetic layer has conical magnetization, caused by the second order easy-axis magnetic anisotropy. We theoretically derive the oscillation frequency and output power and confirm their validity by macrospin simulations. We find that the ratio of the second to the first anisotropy constants is key to determine the maximum frequency and power. Our results will be helpful for the applications of microwave devices utilizing spin-transfer torques and provide a design rule of such devices. (C) 2016 Elsevier B.V. All rights reserved.</P>
Magnetic droplet nucleation with a homochiral Néel domain wall
Kim, Sanghoon,Jang, Peong-Hwa,Kim, Duck-Ho,Ishibashi, Mio,Taniguchi, Takuya,Moriyama, Takahiro,Kim, Kab-Jin,Lee, Kyung-Jin,Ono, Teruo American Physical Society 2017 Physical Review B Vol.95 No.22
<P>We investigate the effect of the Dzyaloshinskii-Moriya interaction (DMI) on magnetic domain nucleation in a ferromagnetic thin film with perpendicular magnetic anisotropy. We propose an extended droplet model to determine the nucleation field as a function of the in-plane field. The model can explain the experimentally observed nucleation in a Co/Ni microstrip with an interfacial DMI. The results are also reproduced by micromagnetic simulation based on the string model. The electrical measurement method proposed here can be widely used to quantitatively determine the DMI energy density.</P>
Correlation between Charge Asphericity and Dzyaloshinskii-Moriya Interaction
Sanghoon Kim,Kohei Ueda,Gyungchoon Go,Peong-Hwa Jang,Kyung-Jin Lee,Abderrezak Belabbes,Aurelien Manchon,Motohiro Suzuki,Yoshinori Kotani,Tetsuya Nakamura,Kohji Nakamura,Tomohiro Koyama,Daichi Chiba,Ki 한국자기학회 2018 한국자기학회 학술연구발표회 논문개요집 Vol.2018 No.3