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Title: Enhancement of perpendicular magnetic anisotropy and transmission of spin-Hall-effect-induced spin currents by a Hf spacer layer in W/Hf/CoFeB/MgO layer structures

We report that strong perpendicular magnetic anisotropy of the ferromagnetic layer in a W/CoFeB/MgO multilayer structure can be established by inserting a Hf layer as thin as 0.25 nm between the W and CoFeB layers. The Hf spacer also allows transmission of spin currents generated by an in-plane charge current in the W layer to apply strong spin torque on the CoFeB, thereby enabling current-driven magnetic switching. The antidamping-like and field-like components of the spin torque exerted on a 1 nm CoFeB layer are of comparable magnitudes in this geometry. Both components originate from the spin Hall effect in the underlying W layer.
Authors:
; ; ;  [1] ;  [2] ;  [1] ;  [3]
  1. Cornell University, Ithaca, New York 14853 (United States)
  2. Department of Physics, Wellesley College, Massachusetts 02481 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
22293059
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 8; 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; ANISOTROPY; COBALT BORIDES; CURRENTS; HAFNIUM; HALL EFFECT; IRON BORIDES; LAYERS; MAGNESIUM OXIDES; SPACERS; SPIN; TORQUE; TRANSMISSION; TUNGSTEN