Growth and Properties of Y 3 Fe 5 O 12 Films on LiNbO 3 Substrates
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th and Properties of Y3Fe5O12 Films on LiNbO3 Substrates A. I. Stognija, N. N. Novitskiia, S. A. Sharkoa, A. I. Serokurovaa, M. N. Smirnovab, and V. A. Ketskob, * a
Scientific–Practical Materials Research Centre, Belarussian Academy of Sciences, vul. Brovki 19, Minsk, 220072 Belarus b Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991 Russia *e-mail: [email protected] Received December 16, 2019; revised March 11, 2020; accepted March 25, 2020
Abstract—Yttrium iron garnet (YIG) (Y3Fe5O12) films have been grown on single-crystal lithium niobate (LiNbO3) ferroelectric substrates by ion beam sputter deposition. X-ray diffraction, electron microscopy, magnetic measurement, and spin wave propagation results for the Y3Fe5O12 films suggest that they can be used in devices for mutual conversion of magnetic and electrical quantities. Keywords: yttrium iron garnet, lithium niobate, interface, spin waves DOI: 10.1134/S0020168520080154
INTRODUCTION In the last decade, considerable attention has been paid to designing materials and thin-film structures for magnonics, a new area of spintronics [1–10]. It is expected that magnonic devices for information transfer will employ spin waves or magnons—magnetization oscillations propagating in magnetically ordered media. The most important advantages of such waves are their large attenuation length, which can be several orders of magnitude larger than the spin diffusion length of devices that employ a spin-polarized current [4], and their short wavelength, which is considerably shorter than the light wavelength at the same frequency. At present, devices whose working principle relies on spin waves employ single-crystal Y3Fe5O12 (YIG) films on gallium gadolinium garnet (GGG) (Gd3Ga5O12) substrates [1, 11]. High-quality YIG films are used for this purpose because they have a small Gilbert attenuation coefficient α (the α of perfect YIG single crystals is ≈5 × 10–5), low coercivity, and high saturation magnetization [4]. Of particular interest is the use of Y3Fe5O12 films for producing structures composed of ferromagnets and ferroelectrics. Interactions in such structures are due to strains induced by magnetic or electric external fields, which result in a magnetoelectric (ME) effect [12, 13]. The ME effect can be used to design fundamentally new highly sensitive magnetic field converters and functional elements in ME control devices and devices for mutual conversion of magnetic and electrical quantities.
The purpose of his work was to grow yttrium iron garnet (Y3Fe5O12) films on single-crystal lithium niobate (LiNbO3) ferroelectric substrates by ion beam sputter deposition. EXPERIMENTAL As ferroelectric substrates, we used commercially available 830-μm-thick Czochralski-grown (100)-oriented single-crystal lithium niobate plates. To remove organic impurities adsorbed on their surface, the substrates were exposed to a microwave oxygen plasma. The target for YIG film growth was prepared from Y3Fe5O12 powder synthesized by t
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