Anisotropy-assisted magnon condensation in ferromagnetic thin films

Abstract

We theoretically demonstrate that adding an easy-axis magnetic anisotropy facilitates magnon condensation in thin yttrium iron garnet (YIG) films. Dipolar interactions in a quasi-equilibrium state stabilize room-temperature magnon condensation in YIG. Even though the out-of-plane easy-axis anisotropy generally competes with the dipolar interactions, we show that adding such magnetic anisotropy may even assist the generation of the magnon condensate electrically via the spin transfer torque mechanism. We use analytical calculations and micromagnetic simulations to illustrate this effect. Our results may explain the recent experiment on Bi-doped YIG and open a pathway toward applying current-driven magnon condensation in quantum spintronics.

5 pages + SM, 4 figures

References in corpus (8)

• The Fascinating World of Landau-Lifshitz-Gilbert Equation: An Overview
• Magnetization oscillations and waves driven by pure spin currents
• Magnon-phonon interactions in magnetic insulators
• Low damping and microstructural perfection of sub-40nm-thin yttrium iron garnet films grown by liquid phase epitaxy
• Stability of Bose Einstein condensates of hot magnons in YIG
• Dynamic phase diagram of dc-pumped magnon condensates
• Stimulated amplification of propagating spin waves
• Bose-Einstein condensation at finite momentum and magnon condensation in thin film ferromagnets

Cited by in corpus (5)

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• Isofrequency spin-wave imaging using color center magnetometry for magnon spintronics
• Enhancement of magnon flux toward a Bose-Einstein condensate
• Ferroelectricity in a magnon Bose-Einstein condensate: Nonreciprocal superfluidity, exceptional points, and Majorana bosons