Bath-induced spin inertia

Abstract

Spin dynamics is usually described as massless or, more precisely, as free of inertia. Recent experiments, however, found direct evidence for inertial spin dynamics. In turn, it is necessary to rethink the basics of spin dynamics. Focusing on a macrospin in an environment (bath), we show that the spin-to-bath coupling gives rise to spin inertia. This bath-induced spin inertia appears universally from all the high-frequency bath modes. We expect our results to provide new insights into recent experiments on spin inertia. Moreover, they indicate that any channel for spin dissipation should also be accompanied by a term accounting for bath-induced spin inertia. As an illustrative example, we consider phonon-bath-induced spin inertia in a YIG/GGG stack.

arXiv comment6 + 4 pages, 1 figure

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Cited by in corpus (10)

• Dynamically generated spin-interactions and nutational spin inertia in normal metal-ferromagnet heterostructures
• Theory of tensorial magnetic inertia in terahertz spin dynamics
• Landau-Lifshitz damping from Lindbladian dissipation in quantum magnets
• Engineering spin-wave spectrum via the magnetization inertia tensor
• Spinor formulation of the Landau-Lifshitz-Gilbert equation with geometric algebra
• Optically induced magnetic inertia and magnons from non-Markovian extension of the Landau-Lifshitz-Gilbert equation
• Controllable and Non-Dissipative Inertial Dynamics of Skyrmion in a Bosonic Platform
• Unquenched orbital angular momentum as the origin of spin inertia
• Using surface plasmons to detect spin inertia
• Chirality and polarization of inertial antiferromagnetic resonances driven by spin-orbit torques