Structural, Magnetic, and Magneto-Optical Properties of Thin Films of BaM Hexaferrite Grown by Laser Molecular Beam Epitaxy

被引：3

作者：

Krichevtsov, Boris ^{[1
]}

Korovin, Alexander ^{[1
]}

Suturin, Sergey ^{[1
]}

Levin, Aleksandr A. ^{[1
]}

Lobov, Ivan ^{[2
]}

Telegin, Andrey ^{[2
]}

Badalyan, Andrey ^{[1
]}

Sakharov, Vladimir ^{[1
]}

Serenkov, Igor ^{[1
]}

Dorogov, Maxim ^{[3
]}

Sokolov, Nikolai ^{[1
]}

机构：

[1] Ioffe Inst, Politechnicheskaya 26, St Petersburg 194021, Russia

[2] MN Mikheev Inst Met Phys, 18 S Kovalevskaya Str, Ekaterinburg 620108, Russia

[3] ITMO Univ, Inst Adv Data Transfer Syst, Kronverksky Pr 49, St Petersburg 197101, Russia

来源：

MATERIALS | 2023年 / 16卷 / 12期

基金：

俄罗斯科学基金会;

关键词：

hexaferrite; molecular beam epitaxy; crystal structure; hysteresis loops; XRD; magneto-optical Kerr effect; VSM; FMR; MICROWAVE; DIFFRACTION; SPECTRA;

D O I：

10.3390/ma16124417

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Thin films of BaM hexaferrite (BaFe12O19) were grown on alpha-Al2O3(0001) substrates by laser molecular beam epitaxy. Structural, magnetic, and magneto-optical properties were studied using medium-energy ion scattering, energy dispersive X-ray spectroscopy, atomic force microscopy, X-ray diffraction, magneto-optical spectroscopy, and magnetometric techniques, and the dynamics of magnetization by ferromagnetic resonance method. It was shown that even a short time annealing drastically changes the structural and magnetic properties of films. Only annealed films demonstrate magnetic hysteresis loops in PMOKE and VSM experiments. The shape of hysteresis loops depends on thickness of films showing practically rectangular loops and high value of remnant magnetization (M-r/M-s similar to 99%) for thin films (50 nm) and much broader and sloped loops in thick (350-500 nm) films. The magnitude of magnetization 4 pi M-s approximate to 4.3 kG in thin films corresponds to that in bulk BaM hexaferrite. Photon energy and sign of bands in magneto-optical spectra of thin films correspond to ones observed earlier in bulk samples and films of BaM hexaferrite. FMR spectra of 50 nm films at 50 GHz consist of a number of narrow lines. The width of main line Delta H similar to 20 Oe is lower than has been reported up to now.

引用

页数：23

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