Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 475, Issue -, Pages 668-674Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2018.12.022
Keywords
Fe/Gd multilayer; Ferrimagnetics; Magnetic properties; Ferromagnetic resonance
Funding
- Russian Foundation for Basic Research [16-02-00061, 18-37-00182]
- Ministry of Education and Science of the Russian Federation [14-Z-50.31.0025]
- Basic Research Program of the Presidium of Russian Academy of Sciences
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Static and dynamic magnetic properties of a ferrimagnetic [Fe(35 angstrom)/Gd(50 angstrom)](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.
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