Optical and magneto-optical properties of GdxFe(100-x) thin films close to the compensation point

Unlike ferromagnetic materials, ferrimagnetic metals have recently received considerable attention due to their bulk perpendicular magnetic anisotropy, low net magnetization and tunable magnetic properties. This makes them perfect candidates for the research of recently discovered spin-torque relate...

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Bibliographic Details
Published in:Scientific reports 2019-11, Vol.9 (1), p.1-8, Article 16547
Main Authors: Jesenská, Eva, Ishibashi, Takayuki, Beran, Lukáš, Pavelka, Martin, Hamrle, Jaroslav, Antoš, Roman, Zázvorka, Jakub, Veis, Martin
Format: Article
Language:English
Subjects:
639/301/119/1001
639/301/119/997
Anisotropy
Compensation
Humanities and Social Sciences
Magnetic properties
Magnetism
Metals
multidisciplinary
Optical properties
Science
Science (multidisciplinary)
Silicon dioxide
Spectroscopy
Thin films
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Summary:Unlike ferromagnetic materials, ferrimagnetic metals have recently received considerable attention due to their bulk perpendicular magnetic anisotropy, low net magnetization and tunable magnetic properties. This makes them perfect candidates for the research of recently discovered spin-torque related phenomena. Among other ferrimagnetic metals, GdFe has an advantage in relatively large magnetic moments in both sublattices and tunability of compensation point above the room temperature by small changes in its composition. We present a systematic study of optical and magneto-optical properties of amorphous Gd x Fe (100-x) thin films of various compositions (x = 18.3, 20.0, 24.7, 26.7) prepared by DC sputtering on thermally oxidized SiO 2 substrates. A combination of spectroscopic ellipsometry and magneto-optical spectroscopy in the photon energy range from 1.5 to 5.5 eV with advanced theoretical models allowed us to deduce the spectral dependence of complete permittivity tensors across the compensation point. Such information is important for further optical detection of spin related phenomena driven by vicinity of compensation point in nanostructures containing GdFe.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-019-52252-z