Switching of magnon parametric oscillation by magnetic field direction

Abstract

Parametric oscillation occurs when the resonance frequency of an oscillator is periodically modulated. Owing to time-reversal symmetry breaking in magnets, nonreciprocal magnons can be parametrically excited when spatial-inversion symmetry breaking is provided. This means that magnons with opposite propagation directions have different amplitudes. Here we demonstrate switching on and off the magnon parametric oscillation by reversing the external field direction applied to a Y${}_3$Fe${}_5$O${}_{12}$ micro-structured film. The result originates from the nonreciprocity of surface mode magnons, leading to field-direction dependence of the magnon accumulation under a nonuniform microwave pumping. Our numerical calculation well reproduces the experimental result.

arXiv comment5 pages, 4 figures

References in corpus (14)

• The design and verification of Mumax3
• Enhanced Gilbert Damping in Thin Ferromagnetic Films
• Direct electronic measurement of the spin Hall effect
• Room Temperature Reversible Spin Hall Effect
• Electrical detection of spin pumping due to the precessing magnetization of a single ferromagnet
• Nonreciprocal spin wave propagation in chiral-lattice ferromagnets
• Direct detection of magnon spin transport by the inverse spin Hall effect
• Experimental observation of a large ac-spin Hall effect
• Detection of the microwave spin pumping using the inverse spin Hall effect
• Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale
• Nonreciprocal magnons and symmetry-breaking in the noncentrosymmetric antiferromagnet
• Phase-sensitive detection of spin pumping via the ac inverse spin Hall effect
• Electrical Detection of Direct and Alternating Spin Current Injected from a Ferromagnetic Insulator into a Ferromagnetic Metal
• Topological characterization of classical waves: the topological origin of magnetostatic surface spin waves