Spin Seebeck effect in antiferromagnet nickel oxide in wide ranges of temperature and magnetic field

Ribeiro, P. R. T.; Machado, F.L.A.; Gamino, M.; Azevedo, A.; Rezende, S. M.

doi:10.1103/physrevb.99.094432

Cited by 23 publications

(12 citation statements)

References 55 publications

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“…However, NiO is known to be responsible for creating a SSE signal on its own. A SSE signal from a NiO layer of 200 nm thickness on FM permalloy increases with increasing temperature starting from about 150 K [45]. A magnon diffusion theory for the SSE in AFMs shows that the SSE is expected to go to zero at low temperatures in NiO [46].…”

Section: Introductionmentioning

confidence: 98%

Role of NiO in the nonlocal spin transport through thin NiO films on Y3Fe5O12

et al. 2021

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In spin-transport experiments with spin currents propagating through an antiferromagnetic (AFM) material, the antiferromagnet is mainly treated as a passive spin conductor not generating nor adding any spin current to the system. The spin current transmissivity of the AFM NiO is affected by magnetic fluctuations, peaking at the Néel temperature and decreasing by lowering the temperature. To study the role of antiferromagnetism in local and nonlocal spin-transport experiments, we send spin currents through NiO of various thicknesses placed on Y 3 Fe 5 O 12 . The spin currents are injected either electrically or by thermal gradients and measured at a wide range of temperatures and magnetic field strengths. The transmissive role is reflected in the sign change of the local electrically injected signals and the decrease in signal strength of all other signals by lowering the temperature. The thermally generated signals, however, show an additional upturn below 100 K that is unaffected by an increased NiO thickness. A change in the thermal conductivity could affect these signals. The temperature and magnetic field dependence are similar to those for bulk NiO, indicating that NiO itself contributes to thermally induced spin currents.

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Section: Introductionmentioning

confidence: 98%

Role of NiO in the nonlocal spin transport through thin NiO films on Y3Fe5O12

et al. 2021

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“…Their exceptional transport properties, as well as those reported in Refs. [7][8][9][10][11], are governed by the spin conductance and spin Seebeck coefficients. Rezende et al [27] discussed theoretically the spin Seebeck effect in AFs in contact with a normal metal.…”

Section: Introductionmentioning

confidence: 99%

“…Since the AF in its groundstate is composed of two collinear magnetic sublattices, magnons carry opposite spin angular momentum. The transport of magnons has been experimentally achieved through the longitudinal spin Seebeck effect in AF|NM [7][8][9][10][11][12][13] and FM|AF|NM [14][15][16][17] heterostructures, in which magnons were driven by a thermal gradient across the AF. Alternatively, thermal injection of magnons in AFs has been studied [18,19] by a spin accumulation at the contact with adjacent metals.…”

Section: Introductionmentioning

confidence: 99%

Spin transport in thick insulating antiferromagnetic films

et al. 2020

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Spin transport of magnonic excitations in uniaxial insulating antiferromagnets (AFs) is investigated. In linear response to spin biasing and a temperature gradient, the spin transport properties of normal-metal-insulating antiferromagnet-normal-metal heterostructures are calculated. We focus on the thick-film regime, where the AF is thicker than the magnon equilibration length. This regime allows the use of a drift-diffusion approach, which is opposed to the thin-film limit considered by Bender et al. 2017, where a stochastic approach is justified. We obtain the temperature-and thickness-dependence of the structural spin Seebeck coefficient S and magnon conductance G. In their evaluation we incorporate effects from field-and temperature-dependent spin conserving intermagnon scattering processes. Furthermore, the interfacial spin transport is studied by evaluating the contact magnon conductances in a microscopic model that accounts for the sub-lattice symmetry breaking at the interface. We find that while inter-magnon scattering does slightly suppress the spin Seebeck effect, transport is generally unaffected, with the relevant spin decay length being determined by non-magnon-conserving processes such as Gilbert damping. In addition, we find that while the structural spin conductance may be enhanced near the spin flip transition, it does not diverge due to spin impedance at the normal metal-magnet interfaces.

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“…from a NiO layer of 200 nm thickness on FM permalloy increases with increasing temperature starting from about 150 K [45]. A magnon diffusion theory for the SSE in AFMs shows that the SSE is expected to go to zero at low temperatures in NiO [46].…”

Section: Introductionmentioning

confidence: 98%

Role of NiO in the nonlocal spin transport through thin NiO films on Y$_3$Fe$_5$O$_{12}$

Hoogeboom,

Nicolaas,

Alexander

et al. 2020

Preprint

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Spin Seebeck effect in antiferromagnet nickel oxide in wide ranges of temperature and magnetic field

Cited by 23 publications

References 55 publications

Role of NiO in the nonlocal spin transport through thin NiO films on Y3Fe5O12

Role of NiO in the nonlocal spin transport through thin NiO films on Y3Fe5O12

Spin transport in thick insulating antiferromagnetic films

Role of NiO in the nonlocal spin transport through thin NiO films on Y$_3$Fe$_5$O$_{12}$

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