Magnetic resonance force spectroscopy of multilayer films Co/Pt with perpendicular magnetic anisotropy

•The magnetic resonance force microscopy (MRFM) of multilayer Co/Pt structures.•The correlation between domain scales and resonance frequencies.•MRFM measurements of internal field of perpendicular magnetic anisotropy.•MRFM measurements of interface exchange field in composite structures. The magnet...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2021-01, Vol.518, p.167396, Article 167396
Main Authors: Skorokhodov, E.V., Sapozhnikov, M.V., Ermolaeva, O.L., Gusev, N.S., Fraerman, A.A., Mironov, V.L.
Format: Article
Language:English
Subjects:
Cobalt
Demagnetization
Domain structure
Domains
Ferromagnetic materials
Ferromagnetic resonance
Kerr effects
Kerr magnetooptical effect
Magnetic anisotropy
Magnetic fields
Magnetic force microscopy
Magnetic properties
Magnetic resonance force spectroscopy
Microscopy
Multilayers
Perpendicular anisotropy
Platinum
Resonant frequencies
Spectrum analysis
Thin films
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Summary:•The magnetic resonance force microscopy (MRFM) of multilayer Co/Pt structures.•The correlation between domain scales and resonance frequencies.•MRFM measurements of internal field of perpendicular magnetic anisotropy.•MRFM measurements of interface exchange field in composite structures. The magnetic resonance force microscopy (MRFM) in combination with magneto-optical Kerr effect spectroscopy and magnetic force microscopy is used to study ferromagnetic resonance in multilayer thin-film structures [Co(0.5 nm)/Pt(1 nm)]5 with perpendicular magnetic anisotropy. Both the uniformly magnetized state and nonhomogeneous domain structures with different spatial scales are studied. It is shown that labyrinth domain structure manifests itself in the MRFM spectra as specific resonances that are split in an external magnetic field. In zero magnetic field the resonant frequencies depend on the size of oppositely magnetized domains due to internal demagnetizing fields and magnetostatic interaction through overlapping strain fields. For composite sample [Co(0.5 nm)/Pt(1 nm)]5Co(1.3 nm) the decrease in the spatial scale of domain structure and decrease in resonance frequencies are observed, which are due to the effect of interface exchange field. The obtained results demonstrate the ability of MRFM to study the resonance properties of highly inhomogeneous magnetic states of ferromagnetic structures, especially in zero magnetic fields.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2020.167396