Epitaxial yttrium iron garnet films grown by pulsed laser deposition

Dorsey, Paul; Bushnell, S. E.; Seed, R.; Vittoria, C.

doi:10.1063/1.354927

Cited by 124 publications

(43 citation statements)

References 13 publications

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“…Liquidphase epitaxy (LPE) has been the dominant technique for growing YIG epitaxial films and single crystals in the past few decades [23]. Pulsed laser deposition (PLD) has recently been used to grow epitaxial YIG thin films [24][25][26]. Using a new off-axis sputtering approach, we deposit YIG thin films on Gd3Ga5O12 (GGG) substrates in a custom ultrahigh vacuum sputtering system [12,27].…”

Section: Methodsmentioning

confidence: 99%

Y3Fe5O12 spin pumping for quantitative understanding of pure spin transport and spin Hall effect in a broad range of materials (invited)

Wang

Hammel

et al. 2015

Journal of Applied Physics

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Using Y3Fe5O12 (YIG) thin films grown by our sputtering technique, we study dynamic spin transport in nonmagnetic (NM), ferromagnetic (FM) and antiferromagnetic (AF) materials by ferromagnetic resonance (FMR) spin pumping. From both inverse spin Hall effect (ISHE) and damping enhancement, we determine the spin mixing conductance and spin Hall angle in many metals. Surprisingly, we observe robust spin conduction in AF insulators excited by an adjacent YIG at resonance. This demonstrates that YIG spin pumping is a powerful and versatile tool for understanding spin Hall physics, spin-orbit coupling (SOC), and magnetization dynamics in a broad range of materials.2

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Section: Methodsmentioning

confidence: 99%

Y3Fe5O12 spin pumping for quantitative understanding of pure spin transport and spin Hall effect in a broad range of materials (invited)

Wang

Hammel

et al. 2015

Journal of Applied Physics

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“…We calculate the ellipticity correction factor P = 1.2 as detailed in Refs. [5,25] using a saturation magnetization M s = 140 kA/m and an effective g factor g = 2 [32]. We are now able to evaluate J SP s and E SP as a function of the three parameters g ↑↓ , α SH and λ SD .…”

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confidence: 99%

Experimental Test of the Spin Mixing Interface Conductivity Concept

et al. 2013

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We perform a quantitative, comparative study of the spin pumping, spin Seebeck and spin Hall magnetoresistance effects, all detected via the inverse spin Hall effect in a series of over 20 yttrium iron garnet/Pt samples. Our experimental results fully support present, exclusively spin currentbased, theoretical models using a single set of plausible parameters for spin mixing conductance, spin Hall angle and spin diffusion length. Our findings establish the purely spintronic nature of the aforementioned effects and provide a quantitative description in particular of the spin Seebeck effect.Pure spin currents present a new paradigm in spintronics [1, 2] and spin caloritronics [3]. In particular, spin currents are the origin of spin pumping [4,5], the spin Seebeck effect [6,7] and the spin Hall magnetoresistance (SMR) [8][9][10]. Taken alone, all these effects have been extensively studied, both experimentally [6-9, 11-13] and theoretically [4,[14][15][16][17][18]. From a theoretical point of view, all these effects are governed by the generation of a current of angular momentum via a non-equilibrium process. The flow of this spin current across a ferromagnet/normal metal interface can then be detected. The relevant interface property that determines the spin current transport thereby is the spin mixing conductance. Nevertheless, there has been an ongoing debate regarding the physical origin of the measurement data acquired in spin Seebeck and SMR experiments due to possible contamination with anomalous Nernst effect [19][20][21] or anisotropic magnetoresistance [22,23] caused by static proximity polarization of the normal metal [23]. To settle this issue, a rigorous check of the consistency of the spin-current based physical models across all three effects is needed. If possible contamination effects are absent, according to the spin mixing conductance concept [24], there should exist a generalized Ohm's law between the interfacial spin current and the energy associated with the corresponding non-equilibrium process. This relation should invariably hold for the spin pumping, spin Seebeck and spin Hall magnetoresistance effects, as they are all based on the generation and detection of interfacial, nonequilibrium spin currents. We here put forward heuristic arguments that are strongly supported by experimental evidence for a scaling law that links all aforementioned spin(calori)tronic effects on a fundamental level and allows to trace back their origin to pure spin currents. (c) The spin Hall magnetoresistance is due to the torque exerted on M by an appropriately polarized Js which yields a change in the reflected spin current J r s . The interconversion between Js (J r s ) and the charge currents Jc (J r c ) are due to the (inverse) spin Hall effect in the normal metal.[schematically depicted in Fig. 1(a)], we place YIG / Pt bilayers in a microwave cavity operated at ν = 9.85 GHz to resonantly excite magnetization dynamics. The emission of a spin current density J s across the bilayer interface into the Pt provides...

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“…Although previous studies 18,19,20,21 on YIG films indicated the existence of finite PMA due to stain, a systematic study is still lacking. Here we leverage the lattice-mismatch induced strain in epitaxially grown films to generate a perpendicular surface anisotropy field .…”

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Anomalous Hall hysteresis inTm3Fe5O12/Ptwith strain-induc

et al. 2016

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We demonstrate robust interface strain-induced perpendicular magnetic anisotropy in atomically flat ferrimagnetic insulator Tm 3 Fe 5 O 12 films grown with pulsed laser deposition on substituted-Gd 3 Ga 5 O 12 substrate which maximizes the tensile strain at the interface. In bilayers consisting of Pt and TIG, we observe large squared Hall hysteresis loops over a wide range of thicknesses of Pt at room temperature. When a thin Cu layer is inserted between Pt and TIG, the Hall hysteresis magnitude decays but stays finite as the thickness of Cu increases up to 5 nm. However, if the Cu layer is placed atop Pt instead, the Hall hysteresis magnitude is consistently larger than when the Cu layer with the same thickness is inserted in between for all Cu thicknesses. These results suggest that both the proximityinduced ferromagnetism and spin current contribute to the anomalous Hall effect.

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Epitaxial yttrium iron garnet films grown by pulsed laser deposition

Cited by 124 publications

References 13 publications

Y3Fe5O12 spin pumping for quantitative understanding of pure spin transport and spin Hall effect in a broad range of materials (invited)

Y3Fe5O12 spin pumping for quantitative understanding of pure spin transport and spin Hall effect in a broad range of materials (invited)

Experimental Test of the Spin Mixing Interface Conductivity Concept

Anomalous Hall hysteresis inTm3Fe5O12/Ptwith strain-induc

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