Manifestation of ferromagnetic resonance of permalloy microstripes in magnetic force spectroscopy measurements

• Published in: Journal of magnetism and magnetic materials Vol. 491; p. 165538
• Main Authors: Skorokhodov, E.V., Gorev, R.V., Sapozhnikov, M.V., Mironov, V.L.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.12.2019; Elsevier BV
• Subjects: Ferromagnetic resonance; Ferromagnetism; Ferrous alloys; Inhomogeneity; Magnetic alloys; Magnetic fields; Magnetic force microscopy; Magnetic moments; Magnetic properties of nanostructures; Magnetism; Phase transitions; Spatial distribution; Spectrum analysis; Ferromagnetic resonance; Magnetic force microscopy; Magnetic properties of nanostructures
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2019.165538

•The magnetic resonance force (MRFM) spectra of the permalloy microstripes are experimentally investigated.•The same FMR mode manifests itself in the spectrum as a peak or a dip, depending on the lateral position of the probe.•Numerical simulation of MRFM spectra are in good agreement with experimental data.•The spatial distributions of the oscillation amplitudes of different FMR modes are simulated. Ferromagnetic resonance (FMR) of individual permalloy microstripe is investigated by magnetic resonance force microscopy (MRFM) in the geometry when a probe magnetic moment is parallel to a sample. Three resonant dips in the MRFM spectrum are observed, the lateral shift of the probe relatively to the microstripe leads to consequent transformation of the dips into peaks. This change of the contribution of the same FMR mode in the MRFM spectrum is explained by the change of the phase between magnetic and nonmagnetic probe-sample interaction due to inhomogeneity of the probe magnetic field. Developed micromagnetic simulations of MRFM signal are in a good agreement with experimental data and allow one to analyze the spatial distributions of magnetization oscillations corresponding to the experimental resonant modes.