Thin Films of BaM Hexaferrite with an Inclined Orientation of the Easy Magnetization Axis: Crystal Structure and Magnetic Properties

Thin Films of BaM Hexaferrite with an Inclined Orientation of the Easy Magnetization Axis: Crystal Structure and Magnetic Properties

Thin (~50 nm thick) BaM hexaferrite (BaFe<sub>12</sub>O<sub>19</sub>) films were grown on (1–102) and (0001) cut α-Al<sub>2</sub>O<sub>3</sub> (sapphire) substrates via laser molecular beam epitaxy using a one- or two-stage growth protocol. The advanta...

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Bibliographic Details
Main Authors: Boris Krichevtsov, Alexander Korovin, Vladimir Fedorov, Sergey Suturin, Aleksandr A. Levin, Andrey Telegin, Elena Balashova, Nikolai Sokolov
Format: Article
Language:English
Published: MDPI AG 2024-11-01
Series:Nanomaterials
Subjects:
hexaferrite
molecular beam epitaxy
crystal structure
magnetic anisotropy
hysteresis loops
XRD
Online Access:https://www.mdpi.com/2079-4991/14/23/1883
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Summary:Thin (~50 nm thick) BaM hexaferrite (BaFe<sub>12</sub>O<sub>19</sub>) films were grown on (1–102) and (0001) cut α-Al<sub>2</sub>O<sub>3</sub> (sapphire) substrates via laser molecular beam epitaxy using a one- or two-stage growth protocol. The advantages of a two-stage protocol are shown. The surface morphology, structural and magnetic properties of films were studied using atomic force microscopy, reflected high-energy electron diffraction, three-dimensional X-ray diffraction reciprocal space mapping, powder X-ray diffraction, magneto-optical, and magnetometric methods. Annealed BaFe<sub>12</sub>O<sub>19</sub>/Al<sub>2</sub>O<sub>3</sub> (1–102) structures consist of close-packed islands epitaxially bonded to the substrate. The hexagonal crystallographic axis and the easy axis (EA) of the magnetization of the films are deflected from the normal to the film by an angle of <i>φ</i>~60°. The films exhibit magnetic hysteresis loops for both in-plane <b>H</b><sub>in-plane</sub> and out-of-plane <b>H</b><sub>out-of-plane</sub> magnetic fields. The shape of <i>M</i><sub>out-of-plane</sub>(<i>H</i><sub>in-plane</sub>) and <i>M</i><sub>in-plane</sub>(<i>H</i><sub>in-plane</sub>) hysteresis loops strongly depends on the azimuth <i>θ</i> of the <b>H</b><sub>in plane</sub>, confirming the tilted orientation of the EA. The <i>M</i><sub>out-of-plane</sub>(<i>H</i><sub>out-of-plane</sub>) magnetization curves are caused by the reversible rotation of magnetization and irreversible magnetization jumps associated with the appearance and motion of domain walls. In the absence of a magnetic field, the magnetization is oriented at an angle close to <i>φ</i>.
ISSN:2079-4991

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