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Spatial mapping of torques within a spin Hall nano-oscillator

Artikel i vetenskaplig tidskrift
Författare T. M. Spicer
P. S. Keatley
T. H. J. Loughran
Mykola Dvornik
Ahmad Awad
Philipp Dürrenfeld
Afshin Houshang
Mojtaba Ranjbar
Johan Åkerman
V. V. Kruglyak
R. J. Hicken
Publicerad i Physical Review B
Volym 98
Nummer/häfte 21
ISSN 2469-9950
Publiceringsår 2018
Publicerad vid Institutionen för fysik (GU)
Språk en
Länkar dx.doi.org/10.1103/PhysRevB.98.2144...
Ämneskategorier Fysik

Sammanfattning

Time-resolved scanning Kerr microscopy (TRSKM) was used to study precessional magnetization dynamics induced by a radio frequency (RF) current within a Al2O3/Py(5 nm)/Pt(6 nm)/Au(150 nm) spin Hall nano-oscillator structure. The Au layer was formed into two needle-shaped electrical contacts that concentrated the current in the center of a Py/Pt mesa of 4 mu m diameter. Due to the spin Hall effect, current within the Pt layer drives a spin current into the Py layer, exerting a spin transfer torque (STT). By injecting RF current and exploiting the phase sensitivity of TRSKM and the symmetry of the device structure, the STT and Oersted field torques have been separated and spatially mapped. The STT and torque due to the in-plane Oersted field are observed to exhibit minima at the device center that is ascribed to spreading of RF current that is not observed for DC current. Torques associated with the RF current may destabilize the position of the self-localized bullet mode excited by the DC current and inhibit injection locking. The present study demonstrates the need to characterize both DC and RF current distributions carefully.

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