Research fueled by: Frontiers in Materials: Spintronics Strasboug, France May 13 th, 2012 Expecting...
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Transcript of Research fueled by: Frontiers in Materials: Spintronics Strasboug, France May 13 th, 2012 Expecting...
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Research fueled by:
Frontiers in Materials: SpintronicsStrasboug, France
May 13th, 2012
Expecting the unexpected in the spin Hall effect:
from fundamental to practical
JAIRO SINOVA Vivek Amin
Texas A&M UniversityInstitute of Physics ASCR
Hitachi CambridgeJoerg Wünderlich, A. Irvine, et al
Institute of Physics ASCRTomas Jungwirth, Vít Novák, Karel Vyborny, et al
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Expecting the unexpected in the spin Hall effect: from fundamental to practical! The spin Hall effects is a relativistic spin-orbit coupling phenomenon which can be used to electrically generate or detect spin currents in magnetic and non-magnetic systems. In spite of the short time since its discovery it has now become ubiquitous in the field of spintronics and its development has also sparked a renewed interest in the full understanding of all the relating effects, such as the anomalous Hall effect. Exploiting such effects fully requires a better understanding of the effects and their intricate connections. SHE has been used to create one of the first spin FETs, to measure spin-currents generated by magnetization dynamics, and even to generate spin-currents large enough to produce spin-torque effects! In this talk I attempt to give a short, brief, and possibly oversimplified overview of some of the critical developments of this vibrant subfield of spintronics, its present understanding, its present applications, and some of its future challenges.
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3Nanoelectronics, spintronics, and materials control by spin-orbit coupling
I. Introduction:•Basic AHE and SHE phenomenology•Mechanism
II. Spin Hall effect: the early days I.First proposals: from theory to experimentII.First observations of the extrinsic and intrinsic (optical)
III. Inverse spin Hall effect•Direct iSHE in metals•Spin pumping and FMR
IV.SHE-FET•Spin Hall injection and spin precession manipulation•iSHE device with spin-accumulation modulation
V. SHE as a spin current generator and detector•Spin based FET: old and new paradigm in charge-spin transport•Theory expectations and modeling•Experimental results
VI.Conclusion
Expecting the unexpected in the spin Hall effect:
from fundamental to practical
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4Nanoelectronics, spintronics, and materials control by spin-orbit coupling
The electron: the key character with dual personalities
CHARGECHARGEEasy to manipulate: Coulomb interaction
SPIN 1/2SPIN 1/2Makes the electron antisocial: a fermion
quantum mechanics
E=p2/2mE→ iħ d/dtp→ -iħ d/dr
““Classical” external manipulation of charge & spinClassical” external manipulation of charge & spin
special relativity
E2/c2=p2+m2c2
(E=mc2 for p=0)
+ particles/antiparticles & spin
Dirac equation=
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5Nanoelectronics, spintronics, and materials control by spin-orbit coupling
Using charge and spin in information technology
HIGH tunablity of electronic transportproperties the key to FET success in processing technology
substrate
semiconductor
insulatorS Dgate
Vg >0
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