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Ohnuma, Yuichi; Adachi, Hiroto; Saitoh, Eiji; Maekawa, Sadamichi

doi:10.1103/physrevb.89.174417

Cited by 121 publications

(150 citation statements)

References 68 publications

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“…This indicates the prominent roles of spin fluctuation and short range spin correlation in AF on spin transport [17,18,28]. Note that short range spin correlation in AF still exists at temperatures much higher than T N , as revealed by neutron scattering [29].…”

Section: Prl 116 186601 (2016) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 89%

Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator

Lin¹,

Chen²,

Zhang³

et al. 2016

Phys. Rev. Lett.

247

254

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We report a large enhancement of thermally injected spin current in normal metal (NM)/antiferromagnet (AF)/yttrium iron garnet (YIG), where a thin AF insulating layer of NiO or CoO can enhance the spin current from YIG to a NM by up to a factor of 10. The spin current enhancement in NM=AF=YIG, with a pronounced maximum near the Néel temperature of the thin AF layer, has been found to scale linearly with the spin-mixing conductance at the NM=YIG interface for NM ¼ 3d, 4d, and 5d metals. Calculations of spin current enhancement and spin mixing conductance are qualitatively consistent with the experimental results. DOI: 10.1103/PhysRevLett.116.186601 Pure spin current phenomena and devices are new advents in spin electronics [1,2]. A pure spin current has the unique attribute of delivering spin angular momentum without a net charge current thus with higher energy efficiency. A pure spin current can be generated by several mechanisms, including the spin Hall effect [1][2][3], lateral spin valves [4,5], spin pumping [6,7], and longitudinal spin Seebeck effect (LSSE) [8,9]. The inverse spin Hall effect (ISHE) in a metal can detect a pure spin current by converting it into a charge current with a resultant charge accumulation [3,10]. Inevitably, a spin current decays as it traverses through a material on the scale of the spin diffusion length λ SF , which depends on the strength of the intrinsic spin orbit interaction and the quality of the material [5]. The transmission of a spin current across an interface between two materials, such as a ferromagnet and a nonmagnetic material, is further limited by the spin-mixing conductance at the interface [7]. The rapidly diminishing spin current has severely hampered its exploitation. It is highly desirable to explore ways to enhance pure spin current.Pure spin current phenomena and devices have employed ferromagnetic (F) metals [3][4][5]10], F insulators [8,9], and normal metals (NMs) [3,[8][9][10], where the F magnetization sets the spin index of the spin current injected from the F material, light NM (e.g., Cu) and heavy NM (e.g., Pt), respectively, transmits and detects the spin current. Very recently, spin current exploration involves antiferromagnetic (AF) materials [11][12][13][14][15][16][17][18]. The employment of antiferromagnets in spintronic devices is particularly attractive for terahertz (THz) devices [19]. Recently, spin pumping experiment in Pt=YIG (where YIG ¼ Y 3 Fe 5 O 12 ) shows enhanced spin transport through an intervening AF NiO layer between YIG and Pt at room temperature [13,14]. It was suggested that the spin transport through the AF insulators is related to AF magnons and spin fluctuations [13,14], where the AF spins, strongly coupled to the precessing YIG magnetization, transport the spin current [13,14]. However, thus far, spin transport through AF insulators has only employed ferromagnetic resonance measurements (FMR) at the GHz frequency range [11,[13][14][15]18], which is far less than the characteristic frequencies (up to 1 THz) of the AF NiO...

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Section: Prl 116 186601 (2016) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 89%

Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator

Lin¹,

Chen²,

Zhang³

et al. 2016

Phys. Rev. Lett.

247

254

View full text Add to dashboard Cite

show abstract

“…On the theoretical side, one of the recent progresses is the theoretical finding that the spin pumping signal is intimately related to the dynamic spin susceptibility of target materials [37], which was derived in a close analogy to the linear-response approach to the spin Seebeck effect [38,39]. Indeed, a number of experiments suggesting the correlation between the spin susceptibility and the spin pumping have been accumulating [40][41][42].…”

Section: Introductionmentioning

confidence: 99%

“…Making use of the previous theoretical finding [37] that the strength of the spin pumping is proportional to the imaginary part of the dynamic spin susceptibility of target materials, we calculate temperature dependence of the spin pumping signal in a bilayer composed of an insulating ferromagnet and an s-wave superconductor. By evaluating the dynamic spin susceptibility of the superconducting target material, we show that a pronounced coherence peak appears in the signal immediately below the superconducting transition temperature T c , which survives even in the presence of the impurity spin-orbit scattering.…”

Section: Introductionmentioning

confidence: 99%

Spin pumping into superconductors: A new probe of spin dynamics in a superconducting thin film

2017

Self Cite

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Spin pumping refers to the microwave-driven spin current injection from a ferromagnet into the adjacent target material. We theoretically investigate the spin pumping into superconductors by fully taking account of impurity spin-orbit scattering that is indispensable to describe diffusive spin transport with finite spin diffusion length. We calculate temperature dependence of the spin pumping signal and show that a pronounced coherence peak appears immediately below the superconducting transition temperature T c , which survives even in the presence of the spin-orbit scattering. The phenomenon provides us with a new way of studying the dynamic spin susceptibility in a superconducting thin film. This is contrasted with the nuclear magnetic resonance technique used to study a bulk superconductor.

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“…There are also theoretical studies involving AFI layer. Adachi and Ohnuma et al calculated the spin current due to a temperature difference across the AFI/FI and NM interface [20,26]. Cheng et al studied spin pumping from an AFI layer to a NM layer [21].…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of angular momentum transport across interfaces

et al. 2016

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Angular momentum transport in magnetic multilayered structures plays a central role in spintronic physics and devices. The angular momentum currents or spin currents are carried by either quasi-particles such as electrons and magnons, or by macroscopic order parameters such as local magnetization of ferromagnets. Based on the generic interface exchange interaction, we develop a microscopic theory that describes interfacial spin conductance for various interfaces among nonmagnetic metals, ferromagnetic and antiferromagnetic insulators. Spin conductance and its temperature dependence are obtained for different spin batteries including spin pumping, temperature gradient and spin Hall effect. As an application of our theory, we calculate the spin current in a trilayer made of a ferromagnetic insulator, an antiferromagnetic insulator and a non-magnetic heavy metal. The calculated results on the temperature dependence of spin conductance quantitatively agree with the existing experiments. 72.25.Mk, 75.30.Ds

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Enhanced dc spin pumping into a fluctuating ferromagnet nearTC

Cited by 121 publications

References 68 publications

Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator

Enhancement of Thermally Injected Spin Current through an Antiferromagnetic Insulator

Spin pumping into superconductors: A new probe of spin dynamics in a superconducting thin film

Temperature dependence of angular momentum transport across interfaces

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