We have clarified the origin of a magnetically dead interface layer formed in yttrium iron garnet (YIG) films grown at above 700 degrees C onto a gadolinium gallium garnet (GGG) substrate by means of laser molecular beam epitaxy. The diffusion-assisted formation of a Ga-rich region at the YIG/GGG interface is demonstrated by means of composition depth profiling performed by x-ray photoelectron spectroscopy, secondary ion mass spectroscopy, and x-ray and neutron reflectometry. Our finding is in sharp contrast to the earlier expressed assumption that Gd acts as a migrant element in the YIG/GGG system. We further correlate the presence of a Ga-rich transition layer with considerable quenching of ferromagnetic resonance and spin wave propagation in thin YIG films. Finally, we clarify the origin of the enigmatic low-density overlayer that is often observed in neutron and x-ray reflectometry studies of the YIG/GGG epitaxial system.

Role of gallium diffusion in the formation of a magnetically dead layer at the Y3Fe5O12/Gd3Ga5O12 epitaxial interface / Suturin, S. M.; Korovin, A. M.; Bursian, V. E.; Lutsev, L. V.; Bourobina, V.; Yakovlev, N. L.; Montecchi, M.; Pasquali, L.; Ukleev, V.; Vorobiev, A.; Devishvili, A.; Sokolov, N. S.. - In: PHYSICAL REVIEW MATERIALS. - ISSN 2475-9953. - 2:10(2018), pp. 104404_1-104404_9. [10.1103/PhysRevMaterials.2.104404]

Role of gallium diffusion in the formation of a magnetically dead layer at the Y3Fe5O12/Gd3Ga5O12 epitaxial interface

Montecchi, M.;Pasquali, L.;
2018

Abstract

We have clarified the origin of a magnetically dead interface layer formed in yttrium iron garnet (YIG) films grown at above 700 degrees C onto a gadolinium gallium garnet (GGG) substrate by means of laser molecular beam epitaxy. The diffusion-assisted formation of a Ga-rich region at the YIG/GGG interface is demonstrated by means of composition depth profiling performed by x-ray photoelectron spectroscopy, secondary ion mass spectroscopy, and x-ray and neutron reflectometry. Our finding is in sharp contrast to the earlier expressed assumption that Gd acts as a migrant element in the YIG/GGG system. We further correlate the presence of a Ga-rich transition layer with considerable quenching of ferromagnetic resonance and spin wave propagation in thin YIG films. Finally, we clarify the origin of the enigmatic low-density overlayer that is often observed in neutron and x-ray reflectometry studies of the YIG/GGG epitaxial system.
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Role of gallium diffusion in the formation of a magnetically dead layer at the Y3Fe5O12/Gd3Ga5O12 epitaxial interface / Suturin, S. M.; Korovin, A. M.; Bursian, V. E.; Lutsev, L. V.; Bourobina, V.; Yakovlev, N. L.; Montecchi, M.; Pasquali, L.; Ukleev, V.; Vorobiev, A.; Devishvili, A.; Sokolov, N. S.. - In: PHYSICAL REVIEW MATERIALS. - ISSN 2475-9953. - 2:10(2018), pp. 104404_1-104404_9. [10.1103/PhysRevMaterials.2.104404]
Suturin, S. M.; Korovin, A. M.; Bursian, V. E.; Lutsev, L. V.; Bourobina, V.; Yakovlev, N. L.; Montecchi, M.; Pasquali, L.; Ukleev, V.; Vorobiev, A.; Devishvili, A.; Sokolov, N. S.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/1167504
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