TY - JOUR
T1 - Combined frequency and time domain measurements on injection-locked, constriction-based spin Hall nano-oscillators
AU - Hache, T.
AU - Weinhold, T.
AU - Schultheiss, K.
AU - Stigloher, J.
AU - Vilsmeier, F.
AU - Back, C.
AU - Arekapudi, S. S.P.K.
AU - Hellwig, O.
AU - Fassbender, J.
AU - Schultheiss, H.
N1 - Publisher Copyright:
© 2019 Author(s).
PY - 2019/3/11
Y1 - 2019/3/11
N2 - We demonstrate a combined frequency and time domain investigation of injection-locked, constriction-based spin Hall nano-oscillators by Brillouin light scattering (BLS) and the time-resolved magneto-optical Kerr effect (TR-MOKE). This was achieved by applying an ac current in the GHz regime in addition to the dc current which drives auto-oscillations in the constriction. In the frequency domain, we analyze the width of the locking range, the increase in intensity, and the reduction in the linewidth as a function of the applied direct current. Then, we show that the injection locking of the auto-oscillation allows for its investigation by TR-MOKE measurements, a stroboscopic technique that relies on a phase stable excitation, in this case given by the synchronisation to the microwave current. Field sweeps at different dc currents clearly demonstrate the impact of the spin current on the Kerr amplitude. Two-dimensional TR-MOKE and BLS maps show a strong localization of the auto-oscillation within the constriction, independent of the external locking.
AB - We demonstrate a combined frequency and time domain investigation of injection-locked, constriction-based spin Hall nano-oscillators by Brillouin light scattering (BLS) and the time-resolved magneto-optical Kerr effect (TR-MOKE). This was achieved by applying an ac current in the GHz regime in addition to the dc current which drives auto-oscillations in the constriction. In the frequency domain, we analyze the width of the locking range, the increase in intensity, and the reduction in the linewidth as a function of the applied direct current. Then, we show that the injection locking of the auto-oscillation allows for its investigation by TR-MOKE measurements, a stroboscopic technique that relies on a phase stable excitation, in this case given by the synchronisation to the microwave current. Field sweeps at different dc currents clearly demonstrate the impact of the spin current on the Kerr amplitude. Two-dimensional TR-MOKE and BLS maps show a strong localization of the auto-oscillation within the constriction, independent of the external locking.
UR - http://www.scopus.com/inward/record.url?scp=85062989523&partnerID=8YFLogxK
U2 - 10.1063/1.5082692
DO - 10.1063/1.5082692
M3 - Article
AN - SCOPUS:85062989523
SN - 0003-6951
VL - 114
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 10
M1 - 102403
ER -