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Journal Articles

Spin caloric effects in antiferromagnets assisted by an external spin current

Gomonay, O.*; Yamamoto, Kei; Sinova, J.*

Journal of Physics D; Applied Physics, 51(26), p.264004_1 - 264004_9, 2018/07

 Times Cited Count:6 Percentile:45.58(Physics, Applied)

Searching for novel spin caloric effects in antiferromagnets we study the properties of thermally activated magnons in the presence of an external spin current and temperature gradient. We predict the spin Peltier effect - generation of a heat flux by spin accumulation - in an antiferromagnetic insulator with cubic or uniaxial magnetic symmetry. This effect is related with spin-current induced splitting of the relaxation times of the magnons with opposite spin direction. We show that the Peltier effect can trigger antiferromagnetic domain wall motion with a force whose value grows with the temperature of a sample. We also demonstrate that the external spin current can induce the magnon spin Seebeck effect.

Journal Articles

Spin transfer torques and spin-dependent transport in a metallic F/AF/N tunneling junction

Yamamoto, Kei; Gomonay, O.*; Sinova, J.*; Schwiete, G.*

Physical Review B, 98(1), p.014406_1 - 014406_24, 2018/07

 Times Cited Count:1 Percentile:8.26(Materials Science, Multidisciplinary)

Journal Articles

Spin colossal magnetoresistance in an antiferromagnetic insulator

Qiu, Z.*; Hou, D.*; Barker, J.*; Yamamoto, Kei; Gomonay, O.*; Saito, Eiji*

Nature Materials, 17(7), p.577 - 580, 2018/05

 Times Cited Count:71 Percentile:96.98(Chemistry, Physical)

Colossal magnetoresistance (CMR) refers to a large change in electrical conductivity induced by a magnetic field in the vicinity of a metal-insulator transition. CMR occurs due to a correlation between the magnetic structure and electron conduction and has inspired extensive studies for decades. Here, in the antiferromagnetic insulator Cr$$_{2}$$O$$_{3}$$, we found a sharp transition between conducting and nonconducting states for spin currents at room temperature. The spin-current transmission changes by two orders of magnitude within a narrow temperature window of 14K around the Neel temperature. The spin conductor-nonconductor transition can be modulated by a magnetic field, giving an isothermal change of spin-current transmission of up to 500%, effectively an on-off switch for spin currents.

Oral presentation

Transport properties of antiferromagnetic tunneling junctions

Yamamoto, Kei; Gomonay, O.*; Sinova, J.*; Schwiete, G.*

no journal, , 

We study a ferromagnetic-antiferromagnetic-normal metal tunneling junction using non-equilibrium Green's function techniques and derive microscopic formulae for various types of spin torque as well as charge and spin conductance. Relative strength of the torques and their dependence on control parameters such as the tunneling probabilities to the two leads are presented. We also discuss dynamical consequences of the different torques. Charge and spin transmission is shown to depend on the angle between the ferromagnetic and antiferromagnetic order parameters. We suggest potential applications of these angular dependences.

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