Investigating spin-transfer torques induced by thermal gradients in magnetic tunnel junctions by using micro-cavity ferromagnetic resonance

Cansever H, Narkowicz R, Lenz K, Fowley C, Ramasubramanian L, Yildirim O, Niesen A, Hubner T, Reiss G, Lindner J, Fassbender J, et al. (2018)
JOURNAL OF PHYSICS D-APPLIED PHYSICS 51(22): 224009.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Abstract / Bemerkung
Similar to electrical currents flowing through magnetic multilayers, thermal gradients applied across the bather of a magnetic tunnel junction may induce pure spin-currents and generate 'thermal' spin-transfer torques large enough to induce magnetization dynamics in the free layer. In this study, we describe a novel experimental approach to observe spin-transfer torques induced by thermal gradients in magnetic multilayers by studying their ferromagnetic resonance response in microwave cavities. Utilizing this approach allows for measuring the magnetization dynamics on micron/nanosized samples in open-circuit conditions, i.e. without the need of electrical contacts. We performed first experiments on magnetic tunnel junctions patterned into 6 x 9 mu m(2) ellipses from Co2FeAl/MgO/CoFeB stacks. We conducted microresonator ferromagnetic resonance (FMR) under focused laser illumination to induce thermal gradients in the layer stack and compared them to measurements in which the sample was globally heated from the backside of the substrate. Moreover, we carried out broadband FMR measurements under global heating conditions on the same extended films the microstructures were later on prepared from. The results clearly demonstrate the effect of thermal spin-torque on the FMR response and thus show that the microresonator approach is well suited to investigate thermal spin-transfer-driven processes for small temperatures gradients, far below the gradients required for magnetic switching.
Stichworte
thermal spin transfer torque; microresonator; ferromagnetic resonance; magnetic tunnel junction
Erscheinungsjahr
2018
Zeitschriftentitel
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Band
51
Ausgabe
22
Art.-Nr.
224009
ISSN
0022-3727
eISSN
1361-6463
Page URI
https://pub.uni-bielefeld.de/record/2934395

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Cansever H, Narkowicz R, Lenz K, et al. Investigating spin-transfer torques induced by thermal gradients in magnetic tunnel junctions by using micro-cavity ferromagnetic resonance. JOURNAL OF PHYSICS D-APPLIED PHYSICS. 2018;51(22): 224009.
Cansever, H., Narkowicz, R., Lenz, K., Fowley, C., Ramasubramanian, L., Yildirim, O., Niesen, A., et al. (2018). Investigating spin-transfer torques induced by thermal gradients in magnetic tunnel junctions by using micro-cavity ferromagnetic resonance. JOURNAL OF PHYSICS D-APPLIED PHYSICS, 51(22), 224009. doi:10.1088/1361-6463/aac03d
Cansever, H., Narkowicz, R., Lenz, K., Fowley, C., Ramasubramanian, L., Yildirim, O., Niesen, A., Hubner, T., Reiss, G., Lindner, J., et al. (2018). Investigating spin-transfer torques induced by thermal gradients in magnetic tunnel junctions by using micro-cavity ferromagnetic resonance. JOURNAL OF PHYSICS D-APPLIED PHYSICS 51:224009.
Cansever, H., et al., 2018. Investigating spin-transfer torques induced by thermal gradients in magnetic tunnel junctions by using micro-cavity ferromagnetic resonance. JOURNAL OF PHYSICS D-APPLIED PHYSICS, 51(22): 224009.
H. Cansever, et al., “Investigating spin-transfer torques induced by thermal gradients in magnetic tunnel junctions by using micro-cavity ferromagnetic resonance”, JOURNAL OF PHYSICS D-APPLIED PHYSICS, vol. 51, 2018, : 224009.
Cansever, H., Narkowicz, R., Lenz, K., Fowley, C., Ramasubramanian, L., Yildirim, O., Niesen, A., Hubner, T., Reiss, G., Lindner, J., Fassbender, J., Deac, A.M.: Investigating spin-transfer torques induced by thermal gradients in magnetic tunnel junctions by using micro-cavity ferromagnetic resonance. JOURNAL OF PHYSICS D-APPLIED PHYSICS. 51, : 224009 (2018).
Cansever, H., Narkowicz, R., Lenz, K., Fowley, C., Ramasubramanian, L., Yildirim, O., Niesen, Alessia, Hubner, T., Reiss, Günter, Lindner, J., Fassbender, J., and Deac, A. M. “Investigating spin-transfer torques induced by thermal gradients in magnetic tunnel junctions by using micro-cavity ferromagnetic resonance”. JOURNAL OF PHYSICS D-APPLIED PHYSICS 51.22 (2018): 224009.