Giant Hall effect in metal/insulator composite films

Hui Liu; Rong Kun Zheng; Ge Hui Wen; Xi Xiang Zhang

doi:10.1016/j.vacuum.2003.12.076

Giant Hall effect in metal/insulator composite films

Hui Liu, Rong Kun Zheng, Ge Hui Wen, Xi Xiang Zhang^*

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

5 Scopus citations

Abstract

Metal/insulator composite materials have been fabricated by using co-sputtering at room temperature. Hall effect has been found to be greatly enhanced, when the metal volume fraction decreases from 1 to ∼0.5, in both magnetic and non-magnetic composite films. In non-magnetic Cu _x-(SiO₂)_1-x composite films, nearly three orders of magnitude enhancement in the Hall coefficient is observed. This large enhancement of the Hall coefficient is not only significantly larger than the prediction of the classical percolation theory, but also occurs at a metal concentration identified to be the quantum percolation threshold, which has been accounted for in the framework of the local quantum interference effect. The greatly enhanced extraordinary Hall effect has been observed in different magnetic composites; however, it decreases with increasing temperature. Recently, we have fabricated soft magnetic composite films by using sputtering, which show a nearly temperature-independent giant Hall effect from 5 to 300 K.

Original language	English (US)
Pages (from-to)	603-610
Number of pages	8
Journal	Vacuum
Volume	73
Issue number	3-4
DOIs	https://doi.org/10.1016/j.vacuum.2003.12.076
State	Published - Apr 19 2004
Externally published	Yes
Event	The 4th International Symposium on Applied Plasma Science - Kyoto, Japan Duration: Sep 1 2003 → Sep 5 2003

Keywords

Composites
Hall effect
Percolation
Quantum interference
Sputtering

ASJC Scopus subject areas

Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films

Access to Document

10.1016/j.vacuum.2003.12.076

Cite this

@article{6a1c47cd85154d4c9f7cebf6867e04e5,

title = "Giant Hall effect in metal/insulator composite films",

abstract = "Metal/insulator composite materials have been fabricated by using co-sputtering at room temperature. Hall effect has been found to be greatly enhanced, when the metal volume fraction decreases from 1 to ∼0.5, in both magnetic and non-magnetic composite films. In non-magnetic Cu x-(SiO2)1-x composite films, nearly three orders of magnitude enhancement in the Hall coefficient is observed. This large enhancement of the Hall coefficient is not only significantly larger than the prediction of the classical percolation theory, but also occurs at a metal concentration identified to be the quantum percolation threshold, which has been accounted for in the framework of the local quantum interference effect. The greatly enhanced extraordinary Hall effect has been observed in different magnetic composites; however, it decreases with increasing temperature. Recently, we have fabricated soft magnetic composite films by using sputtering, which show a nearly temperature-independent giant Hall effect from 5 to 300 K.",

keywords = "Composites, Hall effect, Percolation, Quantum interference, Sputtering",

author = "Hui Liu and Zheng, {Rong Kun} and Wen, {Ge Hui} and Zhang, {Xi Xiang}",

year = "2004",

month = apr,

day = "19",

doi = "10.1016/j.vacuum.2003.12.076",

language = "English (US)",

volume = "73",

pages = "603--610",

journal = "Vacuum",

issn = "0042-207X",

publisher = "Elsevier Limited",

number = "3-4",

note = "The 4th International Symposium on Applied Plasma Science ; Conference date: 01-09-2003 Through 05-09-2003",

}

TY - JOUR

T1 - Giant Hall effect in metal/insulator composite films

AU - Liu, Hui

AU - Zheng, Rong Kun

AU - Wen, Ge Hui

AU - Zhang, Xi Xiang

PY - 2004/4/19

Y1 - 2004/4/19

N2 - Metal/insulator composite materials have been fabricated by using co-sputtering at room temperature. Hall effect has been found to be greatly enhanced, when the metal volume fraction decreases from 1 to ∼0.5, in both magnetic and non-magnetic composite films. In non-magnetic Cu x-(SiO2)1-x composite films, nearly three orders of magnitude enhancement in the Hall coefficient is observed. This large enhancement of the Hall coefficient is not only significantly larger than the prediction of the classical percolation theory, but also occurs at a metal concentration identified to be the quantum percolation threshold, which has been accounted for in the framework of the local quantum interference effect. The greatly enhanced extraordinary Hall effect has been observed in different magnetic composites; however, it decreases with increasing temperature. Recently, we have fabricated soft magnetic composite films by using sputtering, which show a nearly temperature-independent giant Hall effect from 5 to 300 K.

AB - Metal/insulator composite materials have been fabricated by using co-sputtering at room temperature. Hall effect has been found to be greatly enhanced, when the metal volume fraction decreases from 1 to ∼0.5, in both magnetic and non-magnetic composite films. In non-magnetic Cu x-(SiO2)1-x composite films, nearly three orders of magnitude enhancement in the Hall coefficient is observed. This large enhancement of the Hall coefficient is not only significantly larger than the prediction of the classical percolation theory, but also occurs at a metal concentration identified to be the quantum percolation threshold, which has been accounted for in the framework of the local quantum interference effect. The greatly enhanced extraordinary Hall effect has been observed in different magnetic composites; however, it decreases with increasing temperature. Recently, we have fabricated soft magnetic composite films by using sputtering, which show a nearly temperature-independent giant Hall effect from 5 to 300 K.

KW - Composites

KW - Hall effect

KW - Percolation

KW - Quantum interference

KW - Sputtering

UR - http://www.scopus.com/inward/record.url?scp=1842612321&partnerID=8YFLogxK

U2 - 10.1016/j.vacuum.2003.12.076

DO - 10.1016/j.vacuum.2003.12.076

M3 - Conference article

AN - SCOPUS:1842612321

SN - 0042-207X

VL - 73

SP - 603

EP - 610

JO - Vacuum

JF - Vacuum

IS - 3-4

T2 - The 4th International Symposium on Applied Plasma Science

Y2 - 1 September 2003 through 5 September 2003

ER -

Giant Hall effect in metal/insulator composite films

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this