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OukJae Lee 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.2
We present a coherent spin-torque nano-oscillator (STNO) with spectral linewidths ≤ 10 MHz based on a nanopillar spin-valve device in which an in-plane magnetic free layer (FL) is excited by a combined out-of-plane and in-plane spin-polarized current under external magnetic fields, approximately cancelling the average in-plane dipolar field. The STNO exhibits enhanced nonlinear effective damping ($\Gamma_{eff}$) in the coherent region, resulting from the torque competition from the two spin polarizers and the spatial variation of the anti-damping effectiveness. This effectively reduces the nonlinear coupling ($v$) between the amplitude and the phase fluctuations.
Observation of the Nernst effect in a GeTe/NiFe structure
Ahn Jeong Ung,Jeon Jeehoon,Cho Seong Won,Lee OukJae,Lee Suyoun,Koo Hyun Cheol 한국물리학회 2023 Current Applied Physics Vol.49 No.-
On the basis of second-harmonic measurements, we separated the thermal effect from the spin–orbit torque in GeTe/NiFe bilayers. The damping-like torque and thermal effect terms are phenomenologically inseparable in the second-harmonic resistance. Several thermomagnetic effects, such as the Nernst effect and spin Seebeck effect, are also mixed in the second-harmonic signals. By exploiting the different external magnetic field dependence of these terms, we extracted the noticeable thermal-related terms. In particular, the ordinary Nernst effect is dominant over other thermal effects such as the anomalous Nernst effect and the spin Seebeck effect in a GeTe/NiFe structure. Furthermore, we have investigated the dependence of the ordinary Nernst effect on the temperature and the electric field applied to GeTe channel. These findings reveal that, in a bulk Rashba device, the thermal effect must be considered when attempting to control the spin–orbit-torque-induced switching.