Spin-Orbitronics: A Route to Control Magnets via Spin-Orbit Interaction

By Upadhyaya, Pramey

Department of Physics and Astronomy, University of California, Los Angles, CA

Published on

Abstract

Relativistic effects, having far reaching consequences for advancing our fundamental understanding of the nature, have so far mostly played an academic role in solid-state systems. For example, electrons moving in atomic orbitals close to the speed of light acquire a relativistic shift in energy via the so-calledspin- orbit interaction (SOI). More recently, the ability to engineer this SOI in magnetic systems has shown potential to extend the reach of relativity into information processing by providing a universal energy-efficient knob to control magnetic order via electrical, thermal, mechanical and optical means [1]. In this talk, I will present this “spin-orbitronic” control for various magnetic systems. In particular, we will focus on the example of spin-orbit-induced manipulation of magnetic domain walls and skyrmions, i.e. particle-like magnetic configurations capable of storing and transporting non-volatile information. Firstly, we will present a strategy to create, move and guide skyrmions electrically at room temperature [2]. Secondly, motivated by lowering the energy dissipated as Joule heating, we theoretically demonstrate the possibility of manipulating domain walls by spin currents transported via dissipation-free channels in spin superfluids and chiral edge states of magnetically-doped topological insulators [3]. Thirdly, we will present domain-wall motion in an all-insulating system via SOI-enabled transfer of angular momentum from fluctuations of magnetic order in the presence of thermal gradients. This transfer, which we refer to as local thermomagnonic torque [4], may thus provide a pathway to either eliminate or harvest thermal energy dissipated via Joule heating. Finally, we demonstrate how single spin states in Nitrogen vacancy center in diamond act as nanoscale probes to measure these local thermomagnonic torques [5].

Bio

Pramey Upadhyaya

Pramey Upadhyaya is a postdoctoral scholar in the Physics and Astronomy department, University of California Los Angeles. He earned his bachelor’s degree in Electrical Engineering from the Indian Institute of Technology Kharagpur, India, in 2009, and the master’s and Ph.D. degree in Electrical Engineering department from the University of California Los Angeles, USA, in 2011 and 2015, respectively. His research has explored theory of classical and quantum spintronic phenomenon, and their device applications, enabled by electrical and thermal control of magnetism. He is a recipient of Director’s fellowship from the Los Alamos National Laboratory (2017), Qualcomm Innovation fellowship (2013) and Intel summer fellowship (2011).

 

References

  1. Hellman et al., Interface-induced phenomena in magnetism, Rev. Mod. Phys. 89, 025006 (2017)
  2. Jiang, Upadhyaya et al., Blowing magnetic skyrmion bubbles, Science 349, 283 (2015); Upadhyaya et al., Electric-field guiding of magnetic skyrmions, Phys. Rev. B 92, 134411 (2015); Yu, Upadhyaya et al. Nanolett. 17, 261 (2017) [3] Upadhyaya et al. Phys. Rev. Lett. 118, 097201 (2017); Upadhyaya et al., Domain wall in a quantum anomalous Hall insulator as a magnetoelectric piston, Phys. Rev. B. Rapid Communications 94, 020411 (2016)
  3. Flebus, Upadhyaya et al., ocal thermomagnonic torques in two-fluid spin dynamics, Phys. Rev. B. 94, 214428 (2016)
  4. Du, Upadhyaya et al. Science (accepted)

Cite this work

Researchers should cite this work as follows:

  • Upadhyaya, Pramey (2017), "Spin-Orbitronics: A Route to Control Magnets via Spin-Orbit Interaction," http://nanohub.org/resources/26889.

    BibTex | EndNote

Time

Location

1004 Wang, Purdue University, West Lafayette, IN

Tags

Spin-Orbitronics: A Route to Control Magnets via Spin-Orbit Interaction
  • Spin-Orbitronics: A Route to Control Magnets via Spin-Orbit Interaction 1. Spin-Orbitronics: A Route to C… 0
    00:00/00:00
  • Outline 2. Outline 31.0643977310644
    00:00/00:00
  • Need for new low-energy computing devices 3. Need for new low-energy comput… 76.443109776443109
    00:00/00:00
  • Promise of magnets 4. Promise of magnets 197.63096429763098
    00:00/00:00
  • Electronics+magnets:advent of spintronics & challenge 5. Electronics+magnets:advent of … 491.05772439105772
    00:00/00:00
  • Spin-orbit interaction:an efficient + universal knob 6. Spin-orbit interaction:an ef… 705.8391725058392
    00:00/00:00
  • Outline 7. Outline 1010.2769436102769
    00:00/00:00
  • Towards 8. Towards"dissipationless" manip… 1087.0537203870538
    00:00/00:00
  • Spin-superfluids 9. Spin-superfluids 1247.4140807474141
    00:00/00:00
  • Spin-superfluid-induced domain-wall motion 10. Spin-superfluid-induced domai… 1683.9506172839506
    00:00/00:00
  • Towards 11. Towards"dissipationless" manip… 1935.5689022355689
    00:00/00:00
  • 12. "Local" thermo-magnonic torque… 1958.5251918585252
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  • 13. "Local" thermo-magnonic torque… 2261.5281948615284
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  • NV Centers:probes to measure fluctuating magnetic fields 14. NV Centers:probes to measure … 2423.1231231231232
    00:00/00:00
  • NV + Magnetic films :resonant modality 15. NV + Magnetic films :resonant… 2713.1464798131465
    00:00/00:00
  • Off-resonant manipulations of NV spin 16. Off-resonant manipulations of … 2751.6850183516849
    00:00/00:00
  • Off-resonant manipulations of NV spin:mechanism 17. Off-resonant manipulations of … 2825.9592926259593
    00:00/00:00
  • Thermo-magnonic torques:strong enough for energy-harvesting 18. Thermo-magnonic torques:strong… 2937.3039706373042
    00:00/00:00
  • Outline 19. Outline 3083.8838838838842
    00:00/00:00
  • Future directions:Long term vision 20. Future directions:Long term vi… 3095.895895895896
    00:00/00:00
  • Future directions:Examples 21. Future directions:Examples 3377.8445111778447
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  • Summary 22. Summary 3603.6369703036371
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