• Title/Summary/Keyword: spin-orbit torque

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Spin orbit torque detected by spin torque FMR in W/CoFeB bilayer

  • Kim, Changsoo;Moon, Kyoung-Woong;Chun, Byong Sun;Kim, Dongseok;Hwang, Chanyong
    • Journal of the Korean Magnetic Resonance Society
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    • v.23 no.2
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    • pp.46-50
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    • 2019

  • Spin orbit torque would be applied as the next generation of MRAM, so many researchers are interested in related field. To make a more efficient device, electric current should convert into spin current with high efficiency. Moreover, it becomes important to measure efficiency of spin orbit torque accurately. We measured spin torque FMR of W/CoFeB hetero structure system with direct current. The efficiencies of the damping like torque and field like torque were measured by using the linewidth and on-resonance field proportional to direct current. In addition, we analyzed that a quadratic shift of the on-response field was caused by the Joule heating.

  • https://doi.org/10.6564/JKMRS.2019.23.2.046 인용 PDF KSCI HTML

Optical measurement and analysis technique for spin-orbit torques (스핀-궤도 돌림힘의 광학적 측정 및 분석법)

  • Yun, Sang-Jun;Moon, Joon;Whang, Hyun-Seok;Choe, Sug-Bong
    • Journal of the Korean Magnetics Society
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    • v.25 no.1
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    • pp.1-3
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    • 2015

  • We demonstrate here an optical measurement technique to quantify the spin-orbit torques. The magnetization dynamics induced by the spin-orbit torques with a sinusoidal current injection is measured by use of polar magneto-optical Kerr effect. The measured signal is then analyzed based on the Landau-Lifhshitz-Gilbert equation with consideration of the spin-orbit torques. The present measurement technique is applied to Pd/Co/Pt films and then, the longitudinal and transverse components of the spin-orbit torques are successfully quantified. The present optical technique provides an alternative way to quantify the spin-orbit torques.

  • https://doi.org/10.4283/JKMS.2015.25.1.001 인용 PDF KSCI

The Origin of the Spin-Orbit Alignment of Galaxy Pairs

  • Moon, Jun-Sung;An, Sung-Ho;Yoon, Suk-Jin
    • The Bulletin of The Korean Astronomical Society
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    • v.46 no.1
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    • pp.28.3-29
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    • 2021

  • Galaxies are not just randomly distributed in space; instead, a variety of galaxy alignments have been found over a wide range of scales. Such alignments are the outcome of the combined effect of interacting neighbors and the surrounding large-scale structure. Here, we focus on the spin-orbit alignment (SOA) of galaxy pairs, the dynamical coherence between the spin of a target galaxy and the orbital angular momentum of its neighbor. Based on a recent cosmological hydrodynamic simulation, the IllustrisTNG project, we identify paired galaxies with mass ratios from 1/10 to 10 at z = 0 and statistically analyze their spin-orbit angle distribution. We find a clear preference for prograde orientations (i.e., SOA), which is more prominent for closer pairs. The SOA is stronger for less massive targets in lower-density regions. The SOA witnessed at z = 0 has been developed progressively since z = 2. There is a clear positive correlation between the alignment strength and the interaction duration with its current neighbor. Our results suggest the scenario in which the SOA is developed mainly by interactions with a neighbor for an extended period of time, rather than by the primordial torque exerted by the large-scale structure.

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