講演情報
[8a-E208-10]Dynamical Stability by Spin Transfer in Vanishing Anisotropy Magnets
〇(P)Troy Dion2, Hidekazu Kurebayashi1,2, Joseph Barker3, Takumi Yamazaki2, Varun K. Kushwaha2, Kilian D. Stenning4, Harry Youel1, Xueyao Hou2, Daniel Prestwood1,4, Gerrit W. Bauer2, Kei Yamamoto5, Takeshi Seki2 (1.UCL, 2.Tohoku Univ., 3.Univ. of Leeds, 4.Imperial College, 5.JAEA)
キーワード：
spin transfer torque、anti-magnonics、isotropic magnet
Magnets are manipulated by spin transfer torque (STT), enabling nano-scale spintronic applications. A standard pendulum hangs down due to gravity but pivot point oscillations force it into a dynamically stable inverted state, known as a Kapitza pendulum. Tuning of perpendicular magnetic anisotropy can negate dipolar interactions in thin films to create a vanishing anisotropy magnet (VAM) with a flat energy landscape. An external magnetic field creates an energetic maximum oriented antiparallel to the field direction. Under normal conditions the dynamics behave like a regular pendulum but an anti-damping like STT drives the state to the energy maximum, a spintronic analogue to the Kapitza pendulum. At a critical current spin fluctuations cover the entire Bloch sphere which could be used for probabilistic computing. Vanishing anisotropy magnets (VAMs) are a platform for studying unchartered spin dynamics far from equilibrium which includes anti-magnonics.