Wessely, O.; Umerski, A. and Mathon, J.
(2009).
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DOI (Digital Object Identifier) Link:  http://dx.doi.org/10.1103/PhysRevB.80.014419 

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Abstract
Two alternative currentinduced switching geometries, in which the current flows parallel to the magnet/nonmagnet interface, are investigated theoretically using the nonequilibrium Keldysh theory. In the first geometry, the current is perpendicular to the polarizing magnet/nonmagnet interface but parallel to the nonmagnet/switching magnet interface (CPIP). In the second geometry, the current is parallel to both polarizing magnet/nonmagnet and nonmagnet/switching magnet interfaces (CIP). Calculations for a singleorbital tightbinding model indicate that the spin current flowing parallel to the switching magnet/nonmagnet interface can be absorbed by a lateral switching magnet as efficiently as in the traditional currentperpendiculartoplane (CPP) geometry. The results of the model calculations are shown to be valid also for experimentally relevant Co/Cu CPIP system described by fully realistic tightbinding bands fitted to an ab initio band structure. It is shown that almost complete absorption of the incident spin current by a lateral switching magnet occurs when the lateral dimensions of the switching magnet are of the order of 50–100 interatomic distances, i.e., about 20 nm and its height as small as a few atomic planes. It is also demonstrated that strong spin current absorption in the CPIP/CIP geometry is not spoiled by the presence of a rough interface between the switching magnet and nonmagnetic spacer. Polarization achieved using a lateral magnet in the CIP geometry is found to be about 25% of that in the traditional CPP geometry. The present CPIP calculations of the spintransfer torque are also relevant to the socalled purespincurrentinduced magnetization switching that had been recently observed.
Item Type:  Journal Article  

Copyright Holders:  2009 The American Physical Society  
ISSN:  10980121  
Project Funding Details: 


Keywords:  interface magnetism; magnetic switching; spin polarised transport; tightbinding calculations  
Academic Unit/Department:  Mathematics, Computing and Technology > Mathematics and Statistics Mathematics, Computing and Technology 

Item ID:  18022  
Depositing User:  Andrey Umerski  
Date Deposited:  27 Aug 2009 13:28  
Last Modified:  16 Jan 2016 02:48  
URI:  http://oro.open.ac.uk/id/eprint/18022  
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