Enhancement of thermal spin transfer torque by double-barrier magnetic tunnel junctions with a nonmagnetic metal spacer

Chen, C H; Tseng, Po-Chih; Yang, Ying; Hsueh, Wen–Jeng

doi:10.1088/0953-8984/29/2/025806

Cited by 8 publications

(2 citation statements)

References 38 publications

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“…Thus up to now a purely switching due to a temperature gradient is not realized experimentally. A number of experimental works investigate the thermal STT [173][174][175][176] as well as some theoretical works [177][178][179][180].…”

Section: Introductionmentioning

confidence: 99%

Spin caloric transport from density-functional theory

Popescu¹,

Kratzer²,

Entel³

et al. 2018

J. Phys. D: Appl. Phys.

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Spin caloric transport refers to the coupling of heat with spin transport. Its applications primarily concern the generation of spin currents and control of magnetisation by temperature gradients for information technology, known by the synonym spin caloritronics. Within the framework of ab-initio theory, new tools are being developed to provide an additional understanding of these phenomena in realistic materials, accounting for the complexity of the electronic structure without adjustable parameters. Here we review this progress, summarising the principles of the density-functional-based approaches in the field and presenting a number of application highlights. Our discussion includes the three most frequently employed approaches to the problem, namely the Kubo, Boltzmann, and Landauer-Büttiker methods. These are showcased in specific examples that span, on the one hand, a wide range of materials, such as bulk metallic alloys, nano-structured metallic and tunnel junctions, or magnetic overlayers on heavy metals, and, on the other hand, a wide range of effects, such as the spin-Seebeck, magneto-Seebeck, and spin-Nernst effects, spin disorder, and the thermal spin-transfer and thermal spin-orbit torques.

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Section: Introductionmentioning

confidence: 99%

Spin caloric transport from density-functional theory

Popescu¹,

Kratzer²,

Entel³

et al. 2018

J. Phys. D: Appl. Phys.

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“…A very high TMR of more than 10 4 % in a bandpass SL [24] has been reported. The TSTT effect in a double barrier (i.e., resonant tunneling) MTJ has also been studied [27], which shows an advantage over a single barrier MTJ. In this study, we propose the use of an antireflective region in the SL structure in the context of TSTT.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Thermal Spin Transfer Torque via Bandpass Energy Filtering

Priyadarshi¹,

Sharma²,

Muralidharan³

2019

Preprint

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We propose employing the energy bandpass filtering approach in a magnetic tunnel junction device as a route to enhance the thermal spin transfer torque. Using the spinresolved non-equilibrium Greens function formalism, we propose to harness the optical analog of anti-reflective coatings in a heterostructure MTJ device, and report a large boost in spin torque in the linear regime of temperature bias. In particular, we discuss the position of transmission function with respect to the Fermi energy that caters the maximum thermal effect. A "boxcar" transmission feature of resulting from the anti-reflective configuration enhances charge and spin transport through the structure in comparison to a normal superlattice configuration. The thermally excited spin transfer torque is enhanced by almost five times with our device designs. Although, the thermally driven spin torque is much smaller than the voltage driven torque, this technique provides an energy efficient way to switch the magnetization. This opens up a new viable area for spintronics applications and with the existing advanced thin-film growth technology, the optimized superlattice configurations can be achieved.

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Improved thermal spin-transfer torque by anti-reflective Fabry-Pérot magnetic tunnel junctions

Daqiq

2021

Superlattices and Microstructures

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Enhancement of thermal spin transfer torque by double-barrier magnetic tunnel junctions with a nonmagnetic metal spacer

Cited by 8 publications

References 38 publications

Spin caloric transport from density-functional theory

Spin caloric transport from density-functional theory

Enhancement of Thermal Spin Transfer Torque via Bandpass Energy Filtering

Improved thermal spin-transfer torque by anti-reflective Fabry-Pérot magnetic tunnel junctions

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