Spin current generation from sputtered Y3Fe5O12 films

Lustikova, J.; Shiomi, Yuki; Qiu, Zhiyong; Kikkawa, Takashi; Iguchi, Ryo; Uchida, K.; Saitoh, Eiji

doi:10.1063/1.4898161

Cited by 54 publications

(37 citation statements)

References 55 publications

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“…In the presence of Pt, increased damping in Pt/YIG occurs due to spin pumping. 16,17 This additional damping can explain the observed FMR linewidth (7.5 Oe) if a reasonable spin mixing conductance value of is assumed.…”

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confidence: 95%

Platinum/yttrium iron garnet inverted structures for spin current transport

Aldosary¹,

Li²,

Tang³

et al. 2016

Applied Physics Letters

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plane uniaxial magnetic anisotropy with a well-defined easy axis along <001> and a peak-topeak ferromagnetic resonance linewidth of 7.5 Oe at 9.32 GHz, similar to YIG epitaxilly grown on GGG. Both spin Hall magnetoresistance and longitudinal spin Seebeck effects in the inverted bilayers indicate excellent Pt/YIG interface quality. 2Magnetic garnets are important materials that offer unique functionalities in a range of bulk and thin film device applications requiring magnetic insulators. 1,2 Among all magnetic insulators, yttrium iron garnet (Y 3 Fe 5 O 12 or YIG) has been most extensively used in various high-frequency devices such as microwave filters, oscillators, and Faraday rotators 3 due to its attractive attributes including ultra-low intrinsic Gilbert damping constant ( as low as 3  10 -5 ) 4 which is two orders of magnitude smaller than that of ferromagnetic metals, high Curie temperature (T C = 550 K), soft magnetization behavior, large band gap (~ 2.85 eV), 5 and relatively easy synthesis in single crystal form. These conventional applications demand bulk YIG crystals or micron-thick films grown by liquid phase epitaxy. 6 For more recent spintronic studies such as the spin Seebeck effect (SSE) 7 and spin pumping, 8 submicron-or nanometer-thick films are typically grown by pulsed laser deposition (PLD) or sputtering. It has been shown that high-quality YIG films can be epitaxially grown directly on GGG substrates due to the same crystalline structure and a very small lattice mismatch of 0.057%. [9][10][11] To form bilayers, a thin polycrystalline metal layer is typically deposited on top of YIG by sputtering, which results in reasonably good interfaces for spin current transport. 7,8,12 For some studies such as the magnon-mediated current drag, 13,14 sandwiches of metal/YIG/metal are required, in which YIG needs to be both magnetic and electrically insulating. However, high-quality bilayers of the reverse order, i.e. YIG on metal, are very difficult to be fabricated. A main challenge is that the YIG growth requires high temperatures and an oxygen environment 15 which can cause significant inter-diffusion, oxidation of the metal layer, etc. and consequently lead to poor structural and electrical properties in both metal and YIG layers.This letter reports controlled growth of high-quality single crystal YIG thin films ranging from 30 to 80 nm in thickness on a 5 nm thick Pt layer atop Gd 3 Ga 5 O 12 or GGG (110) substrate. Combined with low-temperature growth which suppresses the inter-diffusion, 3 subsequent rapid thermal annealing (RTA) and optimization of other growth parameters result in well-defined magnetism, atomically sharp Pt/YIG interface, and atomically flat YIG surface. In addition, despite the intermediate Pt layer that has a drastically different crystal structure from the garnets, the top YIG layer shows desired structural and magnetic properties as if it were epitaxially grown on GGG (110).5  5 mm 2 of commercial GGG (110) single crystal substrates are first cleaned in ultrasonic baths...

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mentioning

confidence: 95%

Platinum/yttrium iron garnet inverted structures for spin current transport

Aldosary¹,

Li²,

Tang³

et al. 2016

Applied Physics Letters

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“…The thermal excitation of a spin current by a temperature gradient is commonly called the spin Seebeck effect (SSE) which is detected by the inverse spin Hall effect (ISHE) [1,2], leading to a thermovoltage similar to the charge analogue, the Seebeck effect. Experimental evidence of the SSE, first in ferromagnetic metals [3], and later, both in semiconductors [4] and in insulators [5][6][7][8], has brought up the question about the origin of the SSE. Of particular interest for spin caloritronics is the observation of the SSE in insulators, which allows us to generate pure spin currents in insulating systems.…”

mentioning

confidence: 99%

“…Magnetometry shows constant magnetic properties for the films, except for the 20 nm films, as shown together with more details on sample fabrication and an analysis of the spin diffusion length of the Pt layer [8,25] in the Supplemental Material [22].…”

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confidence: 99%

Length Scale of the Spin Seebeck Effect

et al. 2015

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We investigate the origin of the spin Seebeck effect in yttrium iron garnet (YIG) samples for film thicknesses from 20 nm to 50 μm at room temperature and 50 K. Our results reveal a characteristic increase of the longitudinal spin Seebeck effect amplitude with the thickness of the insulating ferrimagnetic YIG, which levels off at a critical thickness that increases with decreasing temperature. The observed behavior cannot be explained as an interface effect or by variations of the material parameters. Comparison to numerical simulations of thermal magnonic spin currents yields qualitative agreement for the thickness dependence resulting from the finite magnon propagation length. This allows us to trace the origin of the observed signals to genuine bulk magnonic spin currents due to the spin Seebeck effect ruling out an interface origin and allowing us to gauge the reach of thermally excited magnons in this system for different temperatures. At low temperature, even quantitative agreement with the simulations is found. The thermal excitation of a spin current by a temperature gradient is commonly called the spin Seebeck effect (SSE) which is detected by the inverse spin Hall effect (ISHE) [1,2], leading to a thermovoltage similar to the charge analogue, the Seebeck effect. Experimental evidence of the SSE, first in ferromagnetic metals [3], and later, both in semiconductors [4] and in insulators [5][6][7][8], has brought up the question about the origin of the SSE. Of particular interest for spin caloritronics is the observation of the SSE in insulators, which allows us to generate pure spin currents in insulating systems.However, the underlying mechanism, properties, and the origin of the observed signals have been highly controversial. Thermally induced magnonic spin currents have been suggested as the origin [9,10], based on the presence of the effect in magnetic insulators, which excludes charge currents as the source. Despite this explanation of the origin of the effect, direct experimental evidence has not been reported. While parasitic interface effects [11] were suggested as an alternative source of the SSE due to a polarization of the paramagnetic detector layer [12], generally, the observed effects are now primarily attributed to magnonic spin currents [13,14].Time resolved experiments trying to address the problem by probing the temporal evolution of the SSE have obtained contradictory results: For film thickness up to 61 nm, no cut-off frequency due to an intrinsic limitation by the SSE was observed [15]. In contrast, for μm thick films, a characteristic rise time was found, and a finite magnon propagation length of the order of several 100 nm was put forward as a possible explanation [16,17]. This clearly calls for study to reveal the origin of this discrepancy as it underlies the fundamental mechanism of the SSE and to determine the intrinsic length scale.To clarify the origin of the measured SSE signals, we present a detailed study of the relevant length scales of the longitudinal SSE (LSSE) coveri...

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“…46178.2448 Перспективы интеграции устройств магноники [1,2] с полупроводниковыми электронными компонентами, а также создания монолитных композитных мультифер-роидных структур для устройств стрейнтроники [3,4] стимулируют разработку нежидкофазных технологий получения пленок железоиттриевого граната (ЖИГ). На сегодняшний день наиболее широко используются методы импульсного лазерного напыления [5][6][7], ВЧ магнетронного распыления [8,9] и ионно-лучевого ис-парения [10][11][12]. Сообщалось также о получении пле-нок ЖИГ с использованием золь-гель технологий [13], молекулярно-лучевой эпитаксии [14] и осаждения из газовой фазы [15].…”

Section: (поступило в редакцию 2 августа 2017 г)unclassified

“…Достигнутый за последние годы про-гресс в развитии таких технологий позволяет получать пленки ЖИГ нанометровых (5−100 nm) и субмикрон-ных (100−1000 nm) толщин на подложках гадолиний-галлиевого граната (ГГГ) [5][6][7][8][9][10], Si [10,11], GaN [12]. При этом в таких пленках удается наблюдать рас-пространение субмикронных [7,10] и нанометровых [5] спиновых волн, которые демонстрируют эффекты невза-имности [16], параметрической неустойчивости [17] и позволяют осуществлять эффективный спиновый транс-порт [6][7][8]15]. Однако об обнаружении эффектов рас-пространения магнитоупругих волн (МУВ) в структурах ЖИГ/ГГГ, полученных нежидкофазной эпитаксией, до сих пор не сообщалось.…”

Section: (поступило в редакцию 2 августа 2017 г)unclassified

Магнитоупругие Волны В Субмикронных Пленках ЖИГ, Полученных Ионно-Лучевым Распылением На Подложках Гадолиний-Галлиевого Граната

Хивинцев¹,

Сахаров²,

Высоцкий³

et al. 2018

Журнал Технической Физики

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Обнаружены серии эквидистантных осцилляций в спектре передачи и законе дисперсии поверхностных магнитостатических волн (ПМСВ) Дэймона-Эшбаха, распространяющихся в субмикронных (200 nm) плен-ках железоиттриевого граната (ЖИГ), полученных ионно-лучевым распылением на подложках гадолиний-галлиевого граната (ГГГ). Указанные осцилляции отвечают возбуждению магнитоупругих волн в структуре ЖИГ-ГГГ на частотах резонансного взаимодействия ПМСВ с упругими сдвиговыми модами волноведущей структуры ЖИГ-ГГГ. Полученные результаты указывают, что исследованные пленки ЖИГ характеризуются эффективной магнитоупругой связью спиновой и упругой подсистем и согласованием акустических импедансов на интерфейсе ЖИГ-ГГГ, что позволяет рассматривать технологию ионно-лучевого распыления пленок ЖИГ на подложках ГГГ, как перспективную для создания устройств магноники и стрейнтроники.

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Spin current generation from sputtered Y3Fe5O12 films

Cited by 54 publications

References 55 publications

Platinum/yttrium iron garnet inverted structures for spin current transport

Platinum/yttrium iron garnet inverted structures for spin current transport

Length Scale of the Spin Seebeck Effect

Магнитоупругие Волны В Субмикронных Пленках ЖИГ, Полученных Ионно-Лучевым Распылением На Подложках Гадолиний-Галлиевого Граната

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