Parametric sensitivity analysis on the giant magnetoresistive characteristics of synthetic antiferromagnet-based spin-valves

Jeong Suk Park, Seong Rae Lee, Young Keun Kim, Sang Ho Lim

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

A series of static calculations based on the Landau-Lifschitz-Gilbert equation incorporating a single-domain multilayer model applied on synthetic antiferrimagnet (SyAF) based spin-valve structures was carried out to investigate their giant magnetoresistive (GMR) transfer behaviors. The typical multilayer structure comprises NiFe (3.2)/CoFe (1.6)/Cu (2.8)/CoFe (P2, 3.0)/Ru (0.7)/CoFe (P1, 1.5)/IrMn (9.0) (in nm). Four fitting parameters were obtained from the comparisons between the calculated and experimental results: (i) the indirect exchange coupling energy (J1) between P1 and P2 layers=-1.5erg/cm2, (ii) the exchange biasing energy between P1 and IrMn layer (Jeb)=0.13erg/cm2, (iii) the relative GMR contribution (R) due to the angular difference of magnetizations in CoFe (P2)/Ru/CoFe (P1) trilayers=3%, and (iv) the induced uniaxial anisotropy value (Hua) of CoFe layers=40Oe. These values appear reasonable and are within the range of those reported in the literatures, indicating that the present single-domain model works well. In order to examine how these parameters affect the MR transfer curve, one of these parameters was systematically varied while the rest were fixed. J1 was found to be mainly related with the saturation field (Hs) and the field at which the maximum sub-peak MR ratio (Hsub). Jeb influenced on the effective exchange field (Hex.eff). It was also observed that R increases the total MR ratio, but the MR transfer curve was less affected by Hua.

Original languageEnglish
Pages (from-to)25-31
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Volume250
DOIs
Publication statusPublished - 2002 Sept

Bibliographical note

Funding Information:
This work was supported by Grant No. 2000-2-30100-009-3 from the Basic Research Program of the Korea Science and Engineering Foundation, the National Program for Tera-level Nanodevices of the Korea Ministry of Science and Technology as one of the 21 century Frontier Programs, the National Research Laboratory Program, and by the Advanced Backbone Information and Telecommunication Technology Development Project of the Korea Ministry of Information and Communication through Samsung Advanced Institute of Technology.

Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.

Keywords

  • CoFe/Ru/CoFe
  • Computer simulation
  • Giant magnetoresistance
  • Spin-valve
  • Synthetic antiferromagnet

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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