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Title: Temperature dependent nucleation, propagation, and annihilation of domain walls in all-perpendicular spin-valve nanopillars

We present a study of the temperature dependence of the switching fields in Co/Ni-based perpendicularly magnetized spin-valves. While magnetization reversal of all-perpendicular Co/Ni spin valves at ambient temperatures is typically marked by a single sharp step change in resistance, low temperature measurements can reveal a series of resistance steps, consistent with non-uniform magnetization configurations. We propose a model that consists of domain nucleation, propagation, and annihilation to explain the temperature dependence of the switching fields. Interestingly, low temperature (<30‚ÄČK) step changes in resistance that we associate with domain nucleation have a bimodal switching field and resistance step distribution, attributable to two competing nucleation pathways.
Authors:
;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Department of Physics, New York University, New York, New York 10003 (United States)
  2. (United States)
  3. Institut Jean Lamour, UMR CNRS 7198 Université de Lorraine, Nancy, France 54506 (France)
  4. CMRR, University of California at San Diego, La Jolla, California 92093 (United States)
  5. HGST San Jose Research Center, San Jose, California 95135 (United States)
Publication Date:
OSTI Identifier:
22271202
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 11; 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; 77 NANOSCIENCE AND NANOTECHNOLOGY; COBALT; DOMAIN STRUCTURE; HETEROJUNCTIONS; INTERFACES; MAGNETIZATION; NANOSTRUCTURES; NICKEL; NUCLEATION; SPIN; TEMPERATURE DEPENDENCE