Element-Specific Detection of Sub-Nanosecond Spin-Transfer Torque in a Nanomagnet Ensemble

Emori S, Klewe C, Schmalhorst J-M, Krieft J, Shafer P, Lim Y, Smith DA, Sapkota A, Srivastava A, Mewes C, Jiang Z, et al. (2020)
Nano letters.

Zeitschriftenaufsatz | E-Veröff. vor dem Druck | Englisch
 
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Autor*in
Emori, Satoru; Klewe, Christoph; Schmalhorst, Jan-MichaelUniBi ; Krieft, JanUniBi; Shafer, Padraic; Lim, Youngmin; Smith, David A; Sapkota, Arjun; Srivastava, Abhishek; Mewes, Claudia; Jiang, Zijian; Khodadadi, Behrouz
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Abstract / Bemerkung
Spin currents can exert spin-transfer torques on magnetic systems even in the limit of vanishingly small net magnetization, as recently shown for antiferromagnets. Here, we experimentally show that a spin-transfer torque is operative in a macroscopic ensemble of weakly interacting, randomly magnetized Co nanomagnets. We employ element- and time-resolved X-ray ferromagnetic resonance (XFMR) spectroscopy to directly detect subnanosecond dynamics of the Co nanomagnets, excited into precession with cone angle ≳0.003° by an oscillating spin current. XFMR measurements reveal that as the net moment of the ensemble decreases, the strength of the spin-transfer torque increases relative to those of magnetic field torques. Our findings point to spin-transfer torque as an effective way to manipulate the state of nanomagnet ensembles at subnanosecond time scales.
Erscheinungsjahr
2020
Zeitschriftentitel
Nano letters
eISSN
1530-6992
Page URI
https://pub.uni-bielefeld.de/record/2948416

Zitieren

Emori S, Klewe C, Schmalhorst J-M, et al. Element-Specific Detection of Sub-Nanosecond Spin-Transfer Torque in a Nanomagnet Ensemble. Nano letters. 2020.
Emori, S., Klewe, C., Schmalhorst, J. - M., Krieft, J., Shafer, P., Lim, Y., Smith, D. A., et al. (2020). Element-Specific Detection of Sub-Nanosecond Spin-Transfer Torque in a Nanomagnet Ensemble. Nano letters. doi:10.1021/acs.nanolett.0c01868
Emori, S., Klewe, C., Schmalhorst, J. - M., Krieft, J., Shafer, P., Lim, Y., Smith, D. A., Sapkota, A., Srivastava, A., Mewes, C., et al. (2020). Element-Specific Detection of Sub-Nanosecond Spin-Transfer Torque in a Nanomagnet Ensemble. Nano letters.
Emori, S., et al., 2020. Element-Specific Detection of Sub-Nanosecond Spin-Transfer Torque in a Nanomagnet Ensemble. Nano letters.
S. Emori, et al., “Element-Specific Detection of Sub-Nanosecond Spin-Transfer Torque in a Nanomagnet Ensemble”, Nano letters, 2020.
Emori, S., Klewe, C., Schmalhorst, J.-M., Krieft, J., Shafer, P., Lim, Y., Smith, D.A., Sapkota, A., Srivastava, A., Mewes, C., Jiang, Z., Khodadadi, B., Elmkharram, H., Heremans, J.J., Arenholz, E., Reiss, G., Mewes, T.: Element-Specific Detection of Sub-Nanosecond Spin-Transfer Torque in a Nanomagnet Ensemble. Nano letters. (2020).
Emori, Satoru, Klewe, Christoph, Schmalhorst, Jan-Michael, Krieft, Jan, Shafer, Padraic, Lim, Youngmin, Smith, David A, Sapkota, Arjun, Srivastava, Abhishek, Mewes, Claudia, Jiang, Zijian, Khodadadi, Behrouz, Elmkharram, Hesham, Heremans, Jean J, Arenholz, Elke, Reiss, Günter, and Mewes, Tim. “Element-Specific Detection of Sub-Nanosecond Spin-Transfer Torque in a Nanomagnet Ensemble”. Nano letters (2020).

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