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Autoresonant magnetization switching by spin-orbit torques
Go, Gyungchoon,Lee, Seung-Jae,Lee, Kyung-Jin American Physical Society 2017 Physical review. B Vol.95 No.18
<P>Autoresonance is a self-sustained resonance mechanism due to a driving force whose frequency monotonically varies with time. We theoretically show that the autoresonance mechanism allows an efficient switching of perpendicular magnetization by spin-orbit spin-transfer torques. We find that a threshold current for the autoresonant switching can be much smaller than that of conventional spin-orbit torque switching driven by a DC current. Moreover, the suggested scheme allows fully deterministic switching without the help of any external field.</P>
Spin wave non-reciprocity in spin superfluids
Gyungchoon Go,Se Kwon Kim 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
In a chiral magnet, it has been predicted that a spin-wave propagating along a particular direction and its opposite direction can propagate with different velocity. This novel phenomena, called magneto chiral nonreciprocity, allows efficient magnetic logic device applications such as spin wave diode [1]. For the spin wave nonreciprocity, the chirality of the magnetic material such as chiral exchange interaction (or chiral spin structure) is crucial [2,3]. Here we theoretically demonstrate that the spin wave nonreciprocity can occur in the easy-plane magnet with U(1) symmetry which is known to be the spin superfluid state. We show that the chiral spin structure is manipulated by the electric current flowing in metallic contact and possibly induces the nonreciprocity of the spin waves. We also discuss that the non-reciprocal thermal transport driven by the magnon in the spin superfluid [4].
Narayanapillai, Kulothungasagaran,Go, Gyungchoon,Ramaswamy, Rajagopalan,Gopinadhan, Kalon,Go, Dongwook,Lee, Hyun-Woo,Venkatesan, Thirumalai,Lee, Kyung-Jin,Yang, Hyunsoo American Physical Society 2017 Physical Review B Vol.96 No.6
<P>We report the angular dependence of magnetoresistance in the two-dimensional electron gas at the LaAlO3/SrTiO3 interface. We find that this interfacial magnetoresistance exhibits a similar angular dependence to the spin Hall magnetoresistance observed in ferromagnet/heavy metal bilayers, which has been so far discussed in the framework of the bulk spin Hall effect of the heavy metal layer. The observed magnetoresistance is in qualitative agreement with a theoretical model calculation including both Rashba spin-orbit coupling and an exchange interaction. Our result suggests that magnetic interfaces subject to spin-orbit coupling can generate a non-negligible contribution to the spin Hall magnetoresistance, and the interfacial spin-orbit coupling effect is therefore key to the understanding of various spin-orbit-coupling-related phenomena in magnetic/nonmagnetic bilayers.</P>