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Title: Influence of growth conditions on exchange bias of NiMn-based spin valves

As shown in previous investigations, a correlation between a NiMn-based spin valve's thermal stability and its inherent exchange bias exists, even if the blocking temperature of the antiferromagnet is clearly above the heating temperature and the reason for thermal degradation is mainly diffusion and not the loss of exchange bias. Samples with high exchange bias are thermally more stable than samples with low exchange bias. Those structures promoting a high exchange bias are seemingly the same suppressing thermally induced diffusion processes (A. Wienecke and L. Rissing, “Relationship between thermal stability and layer-stack/structure of NiMn-based GMR systems,” in IEEE Transaction on Magnetic Conference (EMSA 2014)). Many investigations were carried out on the influence of the sputtering parameters as well as the layer thickness on the magnetoresistive effect. The influence of these parameters on the exchange bias and the sample's thermal stability, respectively, was hardly taken into account. The investigation described here concentrates on the last named issue. The focus lies on the influence of the sputtering parameters and layer thickness of the “starting layers” in the stack and the layers forming the (synthetic) antiferromagnet. This paper includes a guideline for the evaluated sputtering conditions and layer thicknesses to realize a highmore » exchange bias and presumably good thermal stability for NiMn-based spin valves with a synthetic antiferromagnet.« less
Authors:
; ;  [1]
  1. Institute for Microproduction Technology, Leibniz Universität Hannover, 30823 Garbsen (Germany)
Publication Date:
OSTI Identifier:
22409999
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 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; ANTIFERROMAGNETIC MATERIALS; ANTIFERROMAGNETISM; CHANNELING; CORRELATIONS; DIFFUSION; INTERMETALLIC COMPOUNDS; LAYERS; MAGNETORESISTANCE; MANGANESE; NICKEL; PHASE STABILITY; PHASE STUDIES; SPIN; SPUTTERING; THERMAL DEGRADATION; THICKNESS; VALVES