Magnetic anisotropies in ultrathin bismuth iron garnet films

Ultrathin bismuth iron garnet Bi3Fe5O12 films were grown epitaxially on (001)-oriented gadolinium gallium garnet substrates. Film thickness varied from two to three dozens of unit cells. Bi3Fe5O12 films grow pseudomorphically on substrates up to a thickness of 20nm, and then a lattice relaxation occ...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2013-06, Vol.335, p.139-143
Main Authors: Popova, Elena, Franco Galeano, Andres Felipe, Deb, Marwan, Warot-Fonrose, Bénédicte, Kachkachi, Hamid, Gendron, François, Ott, Frédéric, Berini, Bruno, Keller, Niels
Format: Article
Language:English
Subjects:
Anisotropy
Bismuth
Bismuth iron garnet
Condensed Matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Epitaxial growth
Exact sciences and technology
Film thickness
Garnets
Iron
Magnetic anisotropy
Magnetic properties and materials
Magnetic properties of monolayers and thin films
Magnetic properties of surface, thin films and multilayers
Magnetization
Magnetization reorientation
Physics
Pulsed laser deposition
Ultrathin film
Unit cell
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Summary:Ultrathin bismuth iron garnet Bi3Fe5O12 films were grown epitaxially on (001)-oriented gadolinium gallium garnet substrates. Film thickness varied from two to three dozens of unit cells. Bi3Fe5O12 films grow pseudomorphically on substrates up to a thickness of 20nm, and then a lattice relaxation occurs. Magnetic properties of the films were studied as a function of bismuth iron garnet thickness. The magnetization and cubic anisotropy decrease with decreasing film thickness. The uniaxial magnetocrystalline anisotropy is constant for all film thicknesses. For two unit cell thick films, the easy magnetization axis changes from in-plane to perpendicular to the plane direction. Such a reorientation takes place as a result of the competition of constant uniaxial perpendicular anisotropy with weakening film magnetization. ► Ultrathin Bi3Fe5O12 films were grown epitaxially on structure-matching substrates. ► Magnetic properties of Bi3Fe5O12 were studied down to the thickness of 2.5nm. ► Reorientation of easy magnetization axis as a function of film thickness was observed.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2013.02.003