Twisted magnetization states and inhomogeneous resonance modes in a Fe/Gd ferrimagnetic multilayer

•Magnetic H-T phase diagram of a Fe/Gd ferrimagnetic superlattice is obtained.•Collinear, twisted and surface twist magnetic states are identified.•Two spectral branches of ferromagnetic resonance are observed.•The observed modes correspond to different types of non-uniform precession in Gd. Static...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2019-04, Vol.475, p.668-674
Main Authors: Drovosekov, A.B., Savitsky, A.O., Kholin, D.I., Kreines, N.M., Proglyado, V.V., Makarova, M.V., Kravtsov, E.A., Ustinov, V.V.
Format: Article
Language:English
Subjects:
Absorption spectra
Computer simulation
Fe/Gd multilayer
Ferrimagnetics
Ferrimagnetism
Ferromagnetic resonance
Ferromagnetism
Gadolinium
Glass substrates
Kerr magnetooptical effect
Magnetic properties
Magnetization
Multilayers
Phase diagrams
Superlattices
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Summary:•Magnetic H-T phase diagram of a Fe/Gd ferrimagnetic superlattice is obtained.•Collinear, twisted and surface twist magnetic states are identified.•Two spectral branches of ferromagnetic resonance are observed.•The observed modes correspond to different types of non-uniform precession in Gd. Static and dynamic magnetic properties of a ferrimagnetic Fe(35Å)/Gd(50Å)12 superlattice were investigated in a wide 4–300 K temperature range using magneto-optical Kerr effect (MOKE) and ferromagnetic resonance (FMR) techniques. The multilayer structure was sputtered on a transparent glass substrate which made it possible to perform MOKE measurements on both Fe and Gd terminated sides of the superlattice. These experiments allowed us to detect a transition between field-aligned and canted magnetic states on both sides of the film and to distinguish between the bulk and surface twisted phases of the superlattice. As a result, the experimental H-T magnetic phase diagram of the system was obtained. FMR studies at frequencies 7–36 GHz demonstrated a complex evolution of absorption spectra as temperature decreased from room down to 4 K. Two spectral branches were detected in the sample. Theoretical simulations show that the observed spectral branches correspond to different types of inhomogeneous resonance modes in the multilayer with non-uniform magnetization precession inside Gd layers.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2018.12.022