Incoherent magnetization reversal process in discontinuous Fe50Co50/Ag multilayer thin films

P. C. Kuo, Y. D. Yao, J. W. Chen, Hsiang-Chih Chiu, Y. D. Yao

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The possibility of incoherent magnetization reversal process in annealed Fe50Co50/Ag multilayer thin films has been studied. Small magnetoresistance was measured in as-deposited films; however, after annealing above 150°C, the highly mobile Ag atoms form bridges between the Ag layers, and the magnetoresistance increases. For example, after annealing at 225°C for 30 minutes, the TEM photographs show clearly the crosssection of a discontinuous multilayer structure, the coercivity is relatively small, and the magnetoresistance reaches its largest value. This is explained by the formation of elongated clusters of disk-like ferromagnetic FeCo particles, the exchange coupling between these particles is weak due to the presence of Ag layer between them. In this case, an incoherent magnetization reversal process is assumed to be dominant. For samples annealed above 250 °C, these disk-like ferromagnetic particles within a column grow larger due to diffusion. The exchange interaction increase due to the Ag atoms migrating to the bridges between the columns and decreasing the distance between disk-like ferromagnetic particles. The coercivity of the film then increases, and a coherent magnetization reversal process is assumed to become dominant.

Original languageEnglish
Pages (from-to)1156-1158
Number of pages3
JournalIEEE Transactions on Magnetics
Volume34
Issue number4 PART 1
DOIs
Publication statusPublished - 1998 Dec 1

Fingerprint

Magnetization reversal
Multilayer films
Magnetoresistance
Coercive force
Thin films
Annealing
Atoms
Exchange coupling
Exchange interactions
Multilayers
Transmission electron microscopy

Keywords

  • Magnetic
  • Magnetoresistance
  • Multilayer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Incoherent magnetization reversal process in discontinuous Fe50Co50/Ag multilayer thin films. / Kuo, P. C.; Yao, Y. D.; Chen, J. W.; Chiu, Hsiang-Chih; Yao, Y. D.

In: IEEE Transactions on Magnetics, Vol. 34, No. 4 PART 1, 01.12.1998, p. 1156-1158.

Research output: Contribution to journalArticle

Kuo, P. C. ; Yao, Y. D. ; Chen, J. W. ; Chiu, Hsiang-Chih ; Yao, Y. D. / Incoherent magnetization reversal process in discontinuous Fe50Co50/Ag multilayer thin films. In: IEEE Transactions on Magnetics. 1998 ; Vol. 34, No. 4 PART 1. pp. 1156-1158.
@article{72a5f276beaa45a3a97ceb635b53044b,
title = "Incoherent magnetization reversal process in discontinuous Fe50Co50/Ag multilayer thin films",
abstract = "The possibility of incoherent magnetization reversal process in annealed Fe50Co50/Ag multilayer thin films has been studied. Small magnetoresistance was measured in as-deposited films; however, after annealing above 150°C, the highly mobile Ag atoms form bridges between the Ag layers, and the magnetoresistance increases. For example, after annealing at 225°C for 30 minutes, the TEM photographs show clearly the crosssection of a discontinuous multilayer structure, the coercivity is relatively small, and the magnetoresistance reaches its largest value. This is explained by the formation of elongated clusters of disk-like ferromagnetic FeCo particles, the exchange coupling between these particles is weak due to the presence of Ag layer between them. In this case, an incoherent magnetization reversal process is assumed to be dominant. For samples annealed above 250 °C, these disk-like ferromagnetic particles within a column grow larger due to diffusion. The exchange interaction increase due to the Ag atoms migrating to the bridges between the columns and decreasing the distance between disk-like ferromagnetic particles. The coercivity of the film then increases, and a coherent magnetization reversal process is assumed to become dominant.",
keywords = "Magnetic, Magnetoresistance, Multilayer",
author = "Kuo, {P. C.} and Yao, {Y. D.} and Chen, {J. W.} and Hsiang-Chih Chiu and Yao, {Y. D.}",
year = "1998",
month = "12",
day = "1",
doi = "10.1109/20.706425",
language = "English",
volume = "34",
pages = "1156--1158",
journal = "IEEE Transactions on Magnetics",
issn = "0018-9464",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "4 PART 1",

}

TY - JOUR

T1 - Incoherent magnetization reversal process in discontinuous Fe50Co50/Ag multilayer thin films

AU - Kuo, P. C.

AU - Yao, Y. D.

AU - Chen, J. W.

AU - Chiu, Hsiang-Chih

AU - Yao, Y. D.

PY - 1998/12/1

Y1 - 1998/12/1

N2 - The possibility of incoherent magnetization reversal process in annealed Fe50Co50/Ag multilayer thin films has been studied. Small magnetoresistance was measured in as-deposited films; however, after annealing above 150°C, the highly mobile Ag atoms form bridges between the Ag layers, and the magnetoresistance increases. For example, after annealing at 225°C for 30 minutes, the TEM photographs show clearly the crosssection of a discontinuous multilayer structure, the coercivity is relatively small, and the magnetoresistance reaches its largest value. This is explained by the formation of elongated clusters of disk-like ferromagnetic FeCo particles, the exchange coupling between these particles is weak due to the presence of Ag layer between them. In this case, an incoherent magnetization reversal process is assumed to be dominant. For samples annealed above 250 °C, these disk-like ferromagnetic particles within a column grow larger due to diffusion. The exchange interaction increase due to the Ag atoms migrating to the bridges between the columns and decreasing the distance between disk-like ferromagnetic particles. The coercivity of the film then increases, and a coherent magnetization reversal process is assumed to become dominant.

AB - The possibility of incoherent magnetization reversal process in annealed Fe50Co50/Ag multilayer thin films has been studied. Small magnetoresistance was measured in as-deposited films; however, after annealing above 150°C, the highly mobile Ag atoms form bridges between the Ag layers, and the magnetoresistance increases. For example, after annealing at 225°C for 30 minutes, the TEM photographs show clearly the crosssection of a discontinuous multilayer structure, the coercivity is relatively small, and the magnetoresistance reaches its largest value. This is explained by the formation of elongated clusters of disk-like ferromagnetic FeCo particles, the exchange coupling between these particles is weak due to the presence of Ag layer between them. In this case, an incoherent magnetization reversal process is assumed to be dominant. For samples annealed above 250 °C, these disk-like ferromagnetic particles within a column grow larger due to diffusion. The exchange interaction increase due to the Ag atoms migrating to the bridges between the columns and decreasing the distance between disk-like ferromagnetic particles. The coercivity of the film then increases, and a coherent magnetization reversal process is assumed to become dominant.

KW - Magnetic

KW - Magnetoresistance

KW - Multilayer

UR - http://www.scopus.com/inward/record.url?scp=0032117971&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032117971&partnerID=8YFLogxK

U2 - 10.1109/20.706425

DO - 10.1109/20.706425

M3 - Article

VL - 34

SP - 1156

EP - 1158

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

SN - 0018-9464

IS - 4 PART 1

ER -