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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Identification of Orbital Pumping from Spin Pumping and Rectification Effects.

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Orbital pumping generates pure orbital current without electrical injection. Researchers differentiated this novel effect from spin pumping by observing voltage sign reversal in Nb/FM bilayers.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Orbital pumping offers a novel route to generate pure orbital currents, bypassing electrical injection challenges.
  • Efficient injection into adjacent nonmagnetic materials is possible, irrespective of conductivity mismatch.
  • Experimental identification is complicated by spin pumping and spin rectification effects (SREs).

Purpose of the Study:

  • To experimentally disentangle orbital pumping from spin pumping and SREs.
  • To investigate orbital current generation in Nb/ferromagnetic material (FM) bilayers.
  • To develop methods for distinguishing orbital pumping signals.

Main Methods:

  • Fabrication of Nb/Ni and Nb/Fe60Co20B20 bilayer structures.
  • Utilizing voltage measurements to detect generated currents.
  • Analyzing angular and spatial dependence of the measured voltage relative to RF excitation.

Main Results:

  • Observed a sign reversal in the measured voltage, indicating disentanglement of orbital and spin pumping effects.
  • Attributed the voltage sign reversal to the opposing signs of spin and orbital Hall effects in Niobium (Nb).
  • Established distinct angular and spatial dependencies for differentiating pumping signals from SREs.

Conclusions:

  • Successfully differentiated orbital pumping from spin pumping in Nb-based bilayers.
  • Demonstrated the feasibility of identifying orbital pumping through voltage sign reversal.
  • Provided a methodology for future experimental studies of orbital pumping effects.