Ferromagnetism in Fe-doped β-Ga2O3 prepared by a solid state reaction

Hajime Hojo; Koji Fujita; Katsuhisa Tanaka; Kazuyuki Hirao

doi:10.1557/proc-853-i4.25

Ferromagnetism in Fe-doped β-Ga₂O₃ prepared by a solid state reaction

Hajime Hojo, Koji Fujita, Katsuhisa Tanaka, Kazuyuki Hirao

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Citations (Scopus)

Abstract

Polycrystalline β-Ga₂O₃ doped with Fe ³⁺, (Ga_1-xFe_x)203 (x=0.02, 0.05, 0.08 and 0.1), has been prepared by a solid-state reaction. Ferromagnetic ordering is observed at room temperature for samples prepared by β-Ga₂O₃ and Fe(NO₃)₃̇9H₂O and sintered at low temperatures below 900°C, while the sintering at temperatures above 900°C leads to the paramagnetic behavior. X-ray diffraction analysis for the samples sintered at 500°C reveals that the single phase of β-Ga ₂O₃ can be obtained up to x=0.08 without traces of secondary phase or other impurity. Magnetization as a function of temperature shows superparamagnetic or cluster spin-glass behavior, indicating that long-range ferromagnetic ordering does not exist in the present systems. It is suggested that the inhomogeneous distribution of Fe³⁺ is responsible for the ferromagnetic behavior.

Original language	English
Title of host publication	Fabrication and New Applications of Nanomagnetic Structures
Publisher	Materials Research Society
Pages	21-26
Number of pages	6
ISBN (Print)	1558998055, 9781558998056
DOIs	https://doi.org/10.1557/proc-853-i4.25
Publication status	Published - 2004
Externally published	Yes
Event	2004 MRS Fall Meeting - Boston, MA, United States Duration: Nov 29 2004 → Dec 3 2004

Publication series

Name	Materials Research Society Symposium Proceedings
Volume	853
ISSN (Print)	0272-9172

Other

Other	2004 MRS Fall Meeting
Country/Territory	United States
City	Boston, MA
Period	11/29/04 → 12/3/04

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1557/proc-853-i4.25

Cite this

Ferromagnetism in Fe-doped β-Ga₂O₃ prepared by a solid state reaction. / Hojo, Hajime; Fujita, Koji; Tanaka, Katsuhisa et al.

Fabrication and New Applications of Nanomagnetic Structures. Materials Research Society, 2004. p. 21-26 (Materials Research Society Symposium Proceedings; Vol. 853).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Hojo, H, Fujita, K, Tanaka, K & Hirao, K 2004, Ferromagnetism in Fe-doped β-Ga₂O₃ prepared by a solid state reaction. in Fabrication and New Applications of Nanomagnetic Structures. Materials Research Society Symposium Proceedings, vol. 853, Materials Research Society, pp. 21-26, 2004 MRS Fall Meeting, Boston, MA, United States, 11/29/04. https://doi.org/10.1557/proc-853-i4.25

@inproceedings{a23e8728598d4149b9ffdc7b6b29bd05,

title = "Ferromagnetism in Fe-doped β-Ga2O3 prepared by a solid state reaction",

abstract = "Polycrystalline β-Ga2O3 doped with Fe 3+, (Ga1-xFex)203 (x=0.02, 0.05, 0.08 and 0.1), has been prepared by a solid-state reaction. Ferromagnetic ordering is observed at room temperature for samples prepared by β-Ga2O3 and Fe(NO3){\.3}9H2O and sintered at low temperatures below 900°C, while the sintering at temperatures above 900°C leads to the paramagnetic behavior. X-ray diffraction analysis for the samples sintered at 500°C reveals that the single phase of β-Ga 2O3 can be obtained up to x=0.08 without traces of secondary phase or other impurity. Magnetization as a function of temperature shows superparamagnetic or cluster spin-glass behavior, indicating that long-range ferromagnetic ordering does not exist in the present systems. It is suggested that the inhomogeneous distribution of Fe3+ is responsible for the ferromagnetic behavior.",

author = "Hajime Hojo and Koji Fujita and Katsuhisa Tanaka and Kazuyuki Hirao",

year = "2004",

doi = "10.1557/proc-853-i4.25",

language = "English",

isbn = "1558998055",

series = "Materials Research Society Symposium Proceedings",

publisher = "Materials Research Society",

pages = "21--26",

booktitle = "Fabrication and New Applications of Nanomagnetic Structures",

address = "United States",

note = "2004 MRS Fall Meeting ; Conference date: 29-11-2004 Through 03-12-2004",

}

TY - GEN

T1 - Ferromagnetism in Fe-doped β-Ga2O3 prepared by a solid state reaction

AU - Hojo, Hajime

AU - Fujita, Koji

AU - Tanaka, Katsuhisa

AU - Hirao, Kazuyuki

PY - 2004

Y1 - 2004

N2 - Polycrystalline β-Ga2O3 doped with Fe 3+, (Ga1-xFex)203 (x=0.02, 0.05, 0.08 and 0.1), has been prepared by a solid-state reaction. Ferromagnetic ordering is observed at room temperature for samples prepared by β-Ga2O3 and Fe(NO3)3̇9H2O and sintered at low temperatures below 900°C, while the sintering at temperatures above 900°C leads to the paramagnetic behavior. X-ray diffraction analysis for the samples sintered at 500°C reveals that the single phase of β-Ga 2O3 can be obtained up to x=0.08 without traces of secondary phase or other impurity. Magnetization as a function of temperature shows superparamagnetic or cluster spin-glass behavior, indicating that long-range ferromagnetic ordering does not exist in the present systems. It is suggested that the inhomogeneous distribution of Fe3+ is responsible for the ferromagnetic behavior.

AB - Polycrystalline β-Ga2O3 doped with Fe 3+, (Ga1-xFex)203 (x=0.02, 0.05, 0.08 and 0.1), has been prepared by a solid-state reaction. Ferromagnetic ordering is observed at room temperature for samples prepared by β-Ga2O3 and Fe(NO3)3̇9H2O and sintered at low temperatures below 900°C, while the sintering at temperatures above 900°C leads to the paramagnetic behavior. X-ray diffraction analysis for the samples sintered at 500°C reveals that the single phase of β-Ga 2O3 can be obtained up to x=0.08 without traces of secondary phase or other impurity. Magnetization as a function of temperature shows superparamagnetic or cluster spin-glass behavior, indicating that long-range ferromagnetic ordering does not exist in the present systems. It is suggested that the inhomogeneous distribution of Fe3+ is responsible for the ferromagnetic behavior.

UR - http://www.scopus.com/inward/record.url?scp=34249874025&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34249874025&partnerID=8YFLogxK

U2 - 10.1557/proc-853-i4.25

DO - 10.1557/proc-853-i4.25

M3 - Conference contribution

AN - SCOPUS:34249874025

SN - 1558998055

SN - 9781558998056

T3 - Materials Research Society Symposium Proceedings

SP - 21

EP - 26

BT - Fabrication and New Applications of Nanomagnetic Structures

PB - Materials Research Society

T2 - 2004 MRS Fall Meeting

Y2 - 29 November 2004 through 3 December 2004

ER -