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Title: Thermal spin-transfer torque in magnetic tunnel junctions (invited)

The thermal spin-transfer torque (TSTT) is an effect to switch the magnetic free layer in a magnetic tunnel junction by a temperature gradient only. We present ab initio calculations of the TSTT. In particular, we discuss the influence of magnetic layer composition by considering Fe{sub x}Co{sub 1–x} alloys. Further, we compare the TSTT to the bias voltage driven STT and discuss the requirements for a possible thermal switching. For example, only for very thin barriers of 3 monolayers MgO, a thermal switching is imaginable. However, even for such a thin barrier, the TSTT is still too small for switching at the moment and further optimization is needed. In particular, the TSTT strongly depends on the composition of the ferromagnetic layer. In our current study, it turns out that at the chosen thickness of the ferromagnetic layer, pure Fe gives the highest thermal spin-transfer torque.
Authors:
; ;  [1]
  1. I. Physikalisches Institut, Justus Liebig University, Giessen (Germany)
Publication Date:
OSTI Identifier:
22273589
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COBALT; COMPARATIVE EVALUATIONS; FERROMAGNETIC MATERIALS; FERROMAGNETISM; HETEROJUNCTIONS; INTERMETALLIC COMPOUNDS; IRON; LAYERS; MAGNESIUM OXIDES; SPIN; TEMPERATURE GRADIENTS; TORQUE; TUNNEL EFFECT