Document Detail


Perpendicular spin torque in magnetic tunnel junctions.
MedLine Citation:
PMID:  20867995     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
A steady-state electrical current flowing in a magnetic heterostructure can exert a torque on the magnetization, and provides a means to control magnetization states and dynamics in spintronics structures. However, some components of the torque are difficult to measure and to calculate. We have determined the perpendicular spin torque in MgO magnetic tunnel junctions by measuring their lowest ferromagnetic resonance frequency and find that it decreases linearly with increasing bias voltage. Micromagnetic modeling shows that this decrease is caused by the perpendicular component of spin torque. We obtain a quantitative value for the perpendicular spin torque effective field as a function of bias voltage, and show that this effective field is a linear function in bias voltage and approximately equal in magnitude to the in-plane spin torque effective field.
Authors:
O G Heinonen; S W Stokes; J Y Yi
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Publication Detail:
Type:  Journal Article     Date:  2010-08-06
Journal Detail:
Title:  Physical review letters     Volume:  105     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-09-27     Completed Date:  2011-01-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  066602     Citation Subset:  -    
Affiliation:
Recording Heads Operation, Seagate Technology, 7801 Computer Ave, Bloomington, Minnesota 55435, USA. heinonen@anl.gov
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