Anisotropic Thermopower and Planar Nernst Effect in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Ga</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Mn</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi>As</mml:mi></mml:math>Ferromagnetic Semiconductors

Pu, Yong; Johnston-Halperin, Ezekiel; Awschalom, D. D.

doi:10.1103/physrevlett.97.036601

Cited by 72 publications

(64 citation statements)

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“…Therefore, other metals with smaller spin-orbit coupling than Pt, not so close to a magnetic instability, should probably be used instead to detect the intrinsic SSE [27]. In any case, our results put an upper limit to the possible observation [28], and Pt/YIG bilayers [24], and can be understood in terms of the Mott relationship between the anomalous Nernst and Hall coefficients [28,29,30,31]. This means that the ANE must be determined by the energy dependence of its electrical charge counterpart: Where  xy =  M z  xx n is the anomalous Hall resistivity [32,33].…”

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confidence: 83%

Anomalous and planar Nernst effects in thin films of the half-metallic ferromagnetLa2/3Sr1/3MnO3

Bui

Rivadulla

2014

Phys. Rev. B

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Keywords: anomalous Nernst effect, planar Nernst effect, Spin Seebeck effect.We report the planar and anomalous Nernst effect in epitaxial thin films of spin polarized La 2/3 Sr 1/3 MnO 3 . The thermal counterpart of the anomalous Hall effect in this material (i.e. the anomalous Nernst effect) shows a extreme sensitivity to any parasitic thermal gradient, resulting in large asymmetric voltages under small temperature differences. This should be considered when interpreting the magnitude of the electrical response in nanostructures and devices that operate under high current densities. Finally, none of the observed magneto-thermoelectric signals is compatible with the observation of the Spin Seebeck Effect in this material.The discovery of intrinsic Spin Seebeck Effect (SSE) in magnetic materials, irrespective of their conductivity, opens unforeseen possibilities for the creation and manipulation of pure spin currents (spin caloritronics) as well as of energy harvesting [ 1,2,3]. Basically, when a thermal gradient is established parallel to the magnetization of a ferromagnet (FM), spin angular momentum is transported along the system in response to the temperature difference. This time-varying magnetization is able to pump a pure spin current at the interface with a paramagnetic metal (normally Pt), which is then transformed into a transverse electrical current via inverse spin Hall effect [4].In FM metals, the different density of states and Fermi velocities for the spin up/down population produce different conductivities for the opposite spin directions [5].Therefore when the spin lifetime is larger than the momentum relaxation time, a spin-

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confidence: 83%

Anomalous and planar Nernst effects in thin films of the half-metallic ferromagnetLa2/3Sr1/3MnO3

Bui

Rivadulla

2014

Phys. Rev. B

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“…In GaMnAs the planar [35] and anomalous [36] Nernst effects have been observed, with intriguing temperature dependences. Slachter et al [37] identified the anomalous Nernst effect and anisotropic magnetoheating in multiterminal permalloy|copper spin valves.…”

Section: B Thermal Hall Effectsmentioning

confidence: 99%

Spin caloritronics

2012

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“…However, it turned out that the TSSE [3][4][5][6][7][8][9][10][11][12][13][14][15][16], especially when using metallic ferromagnets [3-7, 13, 15, 16], is under strong discussion. Other magneto-thermoelectric effects, like the anomalous Nernst effect (ANE) [6,7,[15][16][17] and the anisotropic magneto-thermopower (AMTEP, also known as the planar Nernst effect (PNE)) [4,15,16,18,19] play an important role in the TSSE measurements and contribute to the detected signals. ANE and TSSE signals are antisymmetric with respect to the external magnetic field, have the shape of hysteresis loops and both follow the cos Θ 0 dependence, where Θ 0 is the angle between the magnetization vector M and the temperature gradient ∇T .…”

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confidence: 99%

Dependence of transverse magnetothermoelectric effects on inhomogeneous magnetic fields

et al. 2015

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Transverse magneto-thermoelectric effects are studied in permalloy thin films grown on MgO substrates. We find that small parasitic magnetic fields below 1 Oe can produce artifacts of the order of 1% of the amplitude of the anisotropic magneto-thermopower which is also detected in the experiments. The measured artifacts reveal a new source of uncertainties for the detection of the transverse spin Seebeck effect. Taking these results into account we conclude that the contribution of the transverse spin Seebeck effect to the detected voltages is below the noise level of 20 nV.

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Anisotropic Thermopower and Planar Nernst Effect inGa1−xMnxAsFerromagnetic Semiconductors

Cited by 72 publications

References 17 publications

Anomalous and planar Nernst effects in thin films of the half-metallic ferromagnetLa2/3Sr1/3MnO3

Anomalous and planar Nernst effects in thin films of the half-metallic ferromagnetLa2/3Sr1/3MnO3

Spin caloritronics

Dependence of transverse magnetothermoelectric effects on inhomogeneous magnetic fields

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