Experimental and Numerical Understanding of Localized Spin Wave Mode Behavior in Broadly Tunable Spatially Complex Magnetic Configurations

Abstract

Spin wave modes confined in a ferromagnetic film by the spatially inhomogeneous magnetic field generated by a scanned micromagnetic tip of a ferromagnetic resonance force microscope (FMRFM) enable microscopic imaging of the internal fields and spin dynamics in nanoscale magnetic devices. Here we report a detailed study of spin wave modes in a thin ferromagnetic film localized by magnetic field configurations frequently encountered in FMRFM experiments, including geometries in which the probe magnetic moment is both parallel and antiparallel to the applied uniform magnetic field. We demonstrate that characteristics of the localized modes, such as resonance field and confinement radius, can be broadly tuned by controlling the orientation of the applied field relative to the film plane. Micromagnetic simulations accurately reproduce our FMRFM spectra allowing quantitative understanding of the localized modes. Our results reveal a general method of generating tightly confined spin wave modes in various geometries with excellent spatial resolution that significantly facilitates the broad application of FMRFM. This paves the way to imaging of magnetic properties and spin wave dynamics in a variety of contexts for uncovering new physics of nanoscale spin excitations.

arXiv comment35pages, 6figures

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Cited by in corpus (8)

• Spin Transport in Antiferromagnetic Insulators Mediated by Magnetic Correlations
• Y3Fe5O12 Spin Pumping for Quantitative Understanding of Pure Spin Transport and Spin Hall Effect in a Broad Range of Materials
• Absorption of Microwaves by Random-Anisotropy Magnets
• Nonlinear and Thermal Effects in the Absorption of Microwaves by Random Magnets
• Integral Absorption of Microwave Power by Random-Anisotropy Magnets
• Localized Spin-Wave Modes and Microwave Absorption in Random-Anisotropy Ferromagnets
• Spin orbit torque nano-oscillators by dipole field-localized spin wave modes
• Static and Microwave Properties of Amorphous Magnets Near Saturation