Document Detail


Controlled enhancement of spin-current emission by three-magnon splitting.
MedLine Citation:
PMID:  21725322     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Spin currents-the flow of angular momentum without the simultaneous transfer of electrical charge-play an enabling role in the field of spintronics. Unlike the charge current, the spin current is not a conservative quantity within the conduction carrier system. This is due to the presence of the spin-orbit interaction that couples the spin of the carriers to angular momentum in the lattice. This spin-lattice coupling acts also as the source of damping in magnetic materials, where the precessing magnetic moment experiences a torque towards its equilibrium orientation; the excess angular momentum in the magnetic subsystem flows into the lattice. Here we show that this flow can be reversed by the three-magnon splitting process and experimentally achieve the enhancement of the spin current emitted by the interacting spin waves. This mechanism triggers angular momentum transfer from the lattice to the magnetic subsystem and modifies the spin-current emission. The finding illustrates the importance of magnon-magnon interactions for developing spin-current based electronics.
Authors:
Hidekazu Kurebayashi; Oleksandr Dzyapko; Vladislav E Demidov; Dong Fang; A J Ferguson; Sergej O Demokritov
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-7-03
Journal Detail:
Title:  Nature materials     Volume:  -     ISSN:  1476-1122     ISO Abbreviation:  -     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-7-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101155473     Medline TA:  Nat Mater     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, CB3 0HE, UK.
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