2021年第68回応用物理学会春季学術講演会

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一般セッション(口頭講演)

10 スピントロニクス・マグネティクス » 10.2 スピン基盤技術・萌芽的デバイス技術

[17a-Z19-1~12] 10.2 スピン基盤技術・萌芽的デバイス技術

2021年3月17日(水) 09:00 〜 12:15 Z19 (Z19)

谷口 知大(産総研)、重松 英(京都大学)

09:45 〜 10:00

[17a-Z19-4] Magneto-elastic Boundary Conditions

〇(M2)Takuma Sato1、Weichao Yu1、Simon Streib2、Gerrit E. W. Bauer1,3,4 (1.IMR, Tohoku Univ.、2.Uppsala Univ.、3.WPI-AIMR, Tohoku Univ.、4.Groningen Univ.)

キーワード:magneto-elastic coupling, phonon spin, spin pumping

We derive classically a set of boundary conditions on lattice dynamics in magneto-elastic systems. The resultant equations of stress balance at the interfaces are a natural extension of the conventional theory of elasticity, depends on magnetization, and is applicable to any spin-lattice Hamiltonian as well as boundaries of arbitrary shapes. To exemplify its benefit we apply our formalism to planer and curvilinear geometries, revealing nontrivial magnetization angle dependence of pumped acoustic waves. The natural extension of continuum mechanics allows transfer of knowledge from fields such as seismology and ultrasonics for a better understanding of the spintronics with phonons.