Spin-Hall magnetoresistance and spin Seebeck effect in spin-spiral and paramagnetic phases of multiferroic CoCr2O4 films

A. Aqeel; N. Vlietstra; J. A. Heuver; G. E. W. Bauer; B. Noheda; B. J. van Wees; T. T. M. Palstra

doi:10.1103/PhysRevB.92.224410

Spin-Hall magnetoresistance and spin Seebeck effect in spin-spiral and paramagnetic phases of multiferroic CoCr2O4 films

A. Aqeel, N. Vlietstra, J. A. Heuver, G. E. W. Bauer, B. Noheda, B. J. van Wees, T. T. M. Palstra

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Abstract

We report on the spin-Hall magnetoresistance (SMR) and spin Seebeck effect (SSE) in multiferroic CoCr2O4 (CCO) spinel thin films with Pt contacts. We observe a large enhancement of both signals below the spin-spiral (T-s = 28 K) and the spin lock-in (Tlock-in = 14 K) transitions. The SMR and SSE responses in the spin lock-in phase are one order of magnitude larger than those observed at the ferrimagnetic transition temperature (T-c = 94 K), which indicates that the interaction between spins at the Pt vertical bar CCO interface is more efficient in the noncollinear magnetic state. At T > T-c , magnetic-field-induced SMR and SSE signals are observed, which can be explained by a high interface susceptibility. Our results show that the spin transport at the Pt vertical bar CCO interface is sensitive to the magnetic phases but cannot be explained solely by the bulk magnetization.

Original language	English
Article number	224410
Journal	Physical Review B (Condensed Matter and Materials Physics)
Volume	92
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.92.224410
Publication status	Published - 8 Dec 2015

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@article{04ec52155b9b43d49d624be4de71c389,

title = "Spin-Hall magnetoresistance and spin Seebeck effect in spin-spiral and paramagnetic phases of multiferroic CoCr2O4 films",

abstract = "We report on the spin-Hall magnetoresistance (SMR) and spin Seebeck effect (SSE) in multiferroic CoCr2O4 (CCO) spinel thin films with Pt contacts. We observe a large enhancement of both signals below the spin-spiral (T-s = 28 K) and the spin lock-in (Tlock-in = 14 K) transitions. The SMR and SSE responses in the spin lock-in phase are one order of magnitude larger than those observed at the ferrimagnetic transition temperature (T-c = 94 K), which indicates that the interaction between spins at the Pt vertical bar CCO interface is more efficient in the noncollinear magnetic state. At T > T-c , magnetic-field-induced SMR and SSE signals are observed, which can be explained by a high interface susceptibility. Our results show that the spin transport at the Pt vertical bar CCO interface is sensitive to the magnetic phases but cannot be explained solely by the bulk magnetization.",

author = "A. Aqeel and N. Vlietstra and Heuver, {J. A.} and Bauer, {G. E. W.} and B. Noheda and {van Wees}, {B. J.} and Palstra, {T. T. M.}",

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T1 - Spin-Hall magnetoresistance and spin Seebeck effect in spin-spiral and paramagnetic phases of multiferroic CoCr2O4 films

AU - Aqeel, A.

AU - Vlietstra, N.

AU - Heuver, J. A.

AU - Bauer, G. E. W.

AU - Noheda, B.

AU - van Wees, B. J.

AU - Palstra, T. T. M.

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PY - 2015/12/8

Y1 - 2015/12/8

N2 - We report on the spin-Hall magnetoresistance (SMR) and spin Seebeck effect (SSE) in multiferroic CoCr2O4 (CCO) spinel thin films with Pt contacts. We observe a large enhancement of both signals below the spin-spiral (T-s = 28 K) and the spin lock-in (Tlock-in = 14 K) transitions. The SMR and SSE responses in the spin lock-in phase are one order of magnitude larger than those observed at the ferrimagnetic transition temperature (T-c = 94 K), which indicates that the interaction between spins at the Pt vertical bar CCO interface is more efficient in the noncollinear magnetic state. At T > T-c , magnetic-field-induced SMR and SSE signals are observed, which can be explained by a high interface susceptibility. Our results show that the spin transport at the Pt vertical bar CCO interface is sensitive to the magnetic phases but cannot be explained solely by the bulk magnetization.

AB - We report on the spin-Hall magnetoresistance (SMR) and spin Seebeck effect (SSE) in multiferroic CoCr2O4 (CCO) spinel thin films with Pt contacts. We observe a large enhancement of both signals below the spin-spiral (T-s = 28 K) and the spin lock-in (Tlock-in = 14 K) transitions. The SMR and SSE responses in the spin lock-in phase are one order of magnitude larger than those observed at the ferrimagnetic transition temperature (T-c = 94 K), which indicates that the interaction between spins at the Pt vertical bar CCO interface is more efficient in the noncollinear magnetic state. At T > T-c , magnetic-field-induced SMR and SSE signals are observed, which can be explained by a high interface susceptibility. Our results show that the spin transport at the Pt vertical bar CCO interface is sensitive to the magnetic phases but cannot be explained solely by the bulk magnetization.

U2 - 10.1103/PhysRevB.92.224410

DO - 10.1103/PhysRevB.92.224410

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JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

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