Magnetic field-induced ferromagnetism in iron oxide microspheres

Junhong Wang; Lei Wang; Peng Yu; Dongliang Wang; Yanwei Ma; Kazuo Watanabe

doi:10.1016/j.jmmm.2009.06.030

Magnetic field-induced ferromagnetism in iron oxide microspheres

Junhong Wang, Lei Wang, Peng Yu, Dongliang Wang, Yanwei Ma, Kazuo Watanabe

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

A magnetic field of 12 T was applied during the annealing of amorphous α-Fe₂O₃ microspheres. The authors demonstrate that magnetic field processing leads to the formation of γ-Fe₂O₃ phases in the microspheres, and the field-treated microspheres exhibit typical room-temperature ferromagnetic behavior, whereas non-field-heated sample presents paramagnetism. The improvement in magnetic properties is considered to be a result of magnetic field-induced transformation from α-Fe₂O₃ to γ-Fe₂O₃.

Original language	English
Pages (from-to)	3411-3414
Number of pages	4
Journal	Journal of Magnetism and Magnetic Materials
Volume	321
Issue number	20
DOIs	https://doi.org/10.1016/j.jmmm.2009.06.030
Publication status	Published - 2009 Oct
Externally published	Yes

Keywords

Iron oxide
Magnetic annealing
Magnetic property

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/j.jmmm.2009.06.030

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title = "Magnetic field-induced ferromagnetism in iron oxide microspheres",

abstract = "A magnetic field of 12 T was applied during the annealing of amorphous α-Fe2O3 microspheres. The authors demonstrate that magnetic field processing leads to the formation of γ-Fe2O3 phases in the microspheres, and the field-treated microspheres exhibit typical room-temperature ferromagnetic behavior, whereas non-field-heated sample presents paramagnetism. The improvement in magnetic properties is considered to be a result of magnetic field-induced transformation from α-Fe2O3 to γ-Fe2O3.",

keywords = "Iron oxide, Magnetic annealing, Magnetic property",

author = "Junhong Wang and Lei Wang and Peng Yu and Dongliang Wang and Yanwei Ma and Kazuo Watanabe",

note = "Funding Information: The authors thank X. Bai for his help and useful discussion. This work was supported by the National Science Foundation of China (NSFC) under Grant nos. 50777062 and 50572104.",

year = "2009",

month = oct,

doi = "10.1016/j.jmmm.2009.06.030",

language = "English",

volume = "321",

pages = "3411--3414",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

number = "20",

}

TY - JOUR

T1 - Magnetic field-induced ferromagnetism in iron oxide microspheres

AU - Wang, Junhong

AU - Wang, Lei

AU - Yu, Peng

AU - Wang, Dongliang

AU - Ma, Yanwei

AU - Watanabe, Kazuo

N1 - Funding Information: The authors thank X. Bai for his help and useful discussion. This work was supported by the National Science Foundation of China (NSFC) under Grant nos. 50777062 and 50572104.

PY - 2009/10

Y1 - 2009/10

N2 - A magnetic field of 12 T was applied during the annealing of amorphous α-Fe2O3 microspheres. The authors demonstrate that magnetic field processing leads to the formation of γ-Fe2O3 phases in the microspheres, and the field-treated microspheres exhibit typical room-temperature ferromagnetic behavior, whereas non-field-heated sample presents paramagnetism. The improvement in magnetic properties is considered to be a result of magnetic field-induced transformation from α-Fe2O3 to γ-Fe2O3.

AB - A magnetic field of 12 T was applied during the annealing of amorphous α-Fe2O3 microspheres. The authors demonstrate that magnetic field processing leads to the formation of γ-Fe2O3 phases in the microspheres, and the field-treated microspheres exhibit typical room-temperature ferromagnetic behavior, whereas non-field-heated sample presents paramagnetism. The improvement in magnetic properties is considered to be a result of magnetic field-induced transformation from α-Fe2O3 to γ-Fe2O3.

KW - Iron oxide

KW - Magnetic annealing

KW - Magnetic property

UR - http://www.scopus.com/inward/record.url?scp=67749119920&partnerID=8YFLogxK

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U2 - 10.1016/j.jmmm.2009.06.030

DO - 10.1016/j.jmmm.2009.06.030

M3 - Article

AN - SCOPUS:67749119920

SN - 0304-8853

VL - 321

SP - 3411

EP - 3414

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 20

ER -

Magnetic field-induced ferromagnetism in iron oxide microspheres

Abstract

Keywords

ASJC Scopus subject areas

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