Large variation of magnetic properties of amorphous Fe-Zr thin films with Ar pressure during sputtering

Miri Kim, Nark Eon Sung, Sang Ho Lim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A large change is observed in the magnetic properties of amorphous Fe-Zr thin films sputtered at different Ar pressures. The change depends on the composition of the alloys and at compositions near 60 at.% Fe, for example, the magnetisation measured at 10 kOe increases 30-fold with an increase in the Ar pressure from 2 to 10 mTorr. The magnetic properties are well explained by a combination of two phenomena - superparamagnetism and spin glass behaviours - and the large change is partly related to the number density of a magnetically correlated region. Examinations of the microstructure by X-ray diffraction, transmission electron microscopy, and X-ray absorption fine structure spectroscopy reveal no appreciable difference in it as a function of the Ar pressure. This indicates that even a very slight change in the microstructure can greatly affect the magnetic properties of amorphous Fe-Zr thin films, thereby opening up the possibility of employing the magnetic properties of amorphous alloys for the characterisation of amorphous microstructures.

Original languageEnglish
Article number41894
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - 2017 Jan 31

Fingerprint

sputtering
magnetic properties
thin films
microstructure
spin glass
x rays
examination
fine structure
magnetization
transmission electron microscopy
glass
diffraction
spectroscopy

ASJC Scopus subject areas

  • General

Cite this

Large variation of magnetic properties of amorphous Fe-Zr thin films with Ar pressure during sputtering. / Kim, Miri; Sung, Nark Eon; Lim, Sang Ho.

In: Scientific Reports, Vol. 7, 41894, 31.01.2017.

Research output: Contribution to journalArticle

@article{1992bbc2f9654987bb7a8cddeb61e835,
title = "Large variation of magnetic properties of amorphous Fe-Zr thin films with Ar pressure during sputtering",
abstract = "A large change is observed in the magnetic properties of amorphous Fe-Zr thin films sputtered at different Ar pressures. The change depends on the composition of the alloys and at compositions near 60 at.{\%} Fe, for example, the magnetisation measured at 10 kOe increases 30-fold with an increase in the Ar pressure from 2 to 10 mTorr. The magnetic properties are well explained by a combination of two phenomena - superparamagnetism and spin glass behaviours - and the large change is partly related to the number density of a magnetically correlated region. Examinations of the microstructure by X-ray diffraction, transmission electron microscopy, and X-ray absorption fine structure spectroscopy reveal no appreciable difference in it as a function of the Ar pressure. This indicates that even a very slight change in the microstructure can greatly affect the magnetic properties of amorphous Fe-Zr thin films, thereby opening up the possibility of employing the magnetic properties of amorphous alloys for the characterisation of amorphous microstructures.",
author = "Miri Kim and Sung, {Nark Eon} and Lim, {Sang Ho}",
year = "2017",
month = "1",
day = "31",
doi = "10.1038/srep41894",
language = "English",
volume = "7",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",

}

TY - JOUR

T1 - Large variation of magnetic properties of amorphous Fe-Zr thin films with Ar pressure during sputtering

AU - Kim, Miri

AU - Sung, Nark Eon

AU - Lim, Sang Ho

PY - 2017/1/31

Y1 - 2017/1/31

N2 - A large change is observed in the magnetic properties of amorphous Fe-Zr thin films sputtered at different Ar pressures. The change depends on the composition of the alloys and at compositions near 60 at.% Fe, for example, the magnetisation measured at 10 kOe increases 30-fold with an increase in the Ar pressure from 2 to 10 mTorr. The magnetic properties are well explained by a combination of two phenomena - superparamagnetism and spin glass behaviours - and the large change is partly related to the number density of a magnetically correlated region. Examinations of the microstructure by X-ray diffraction, transmission electron microscopy, and X-ray absorption fine structure spectroscopy reveal no appreciable difference in it as a function of the Ar pressure. This indicates that even a very slight change in the microstructure can greatly affect the magnetic properties of amorphous Fe-Zr thin films, thereby opening up the possibility of employing the magnetic properties of amorphous alloys for the characterisation of amorphous microstructures.

AB - A large change is observed in the magnetic properties of amorphous Fe-Zr thin films sputtered at different Ar pressures. The change depends on the composition of the alloys and at compositions near 60 at.% Fe, for example, the magnetisation measured at 10 kOe increases 30-fold with an increase in the Ar pressure from 2 to 10 mTorr. The magnetic properties are well explained by a combination of two phenomena - superparamagnetism and spin glass behaviours - and the large change is partly related to the number density of a magnetically correlated region. Examinations of the microstructure by X-ray diffraction, transmission electron microscopy, and X-ray absorption fine structure spectroscopy reveal no appreciable difference in it as a function of the Ar pressure. This indicates that even a very slight change in the microstructure can greatly affect the magnetic properties of amorphous Fe-Zr thin films, thereby opening up the possibility of employing the magnetic properties of amorphous alloys for the characterisation of amorphous microstructures.

UR - http://www.scopus.com/inward/record.url?scp=85011636393&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85011636393&partnerID=8YFLogxK

U2 - 10.1038/srep41894

DO - 10.1038/srep41894

M3 - Article

AN - SCOPUS:85011636393

VL - 7

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

M1 - 41894

ER -