Change of magnetic properties and structure in Fe3O4 films on Si substrates with annealing temperature

Sayeeduzzaman Syed; Yasushi Endo; Takanobu Sato; Yoshio Kawamura; Ryoichi Nakatani

doi:10.2320/matertrans.MRA2007200

Change of magnetic properties and structure in Fe₃O₄ films on Si substrates with annealing temperature

Sayeeduzzaman Syed, Yasushi Endo, Takanobu Sato, Yoshio Kawamura, Ryoichi Nakatani

ENG - Electrical Engineering

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

4 Citations (Scopus)

Abstract

We have investigated the magnetic properties and structure of Fe ₃O₄ films on Si substrates before and after annealing at various temperatures, T_a. The saturation magnetization and the coercivity in the Fe₃O₄ films are observed at all T _a. They markedly increase with increasing T_a up to 873 K, and their values become maximum at T_a = 873 K. Furthermore, they slightly decrease above T_a = 873 K. The Fe₃O₄ phase mainly exists in the films at all T_a. In addition, the α-Fe₂O₃ phase (hematite) is also formed in the films above T_a = 873 K. On the basis of these results, it is found that the growth of Fe₃O₄ phase by annealing is mainly dominant in the change of magnetic properties in the Fe₃O₄ film up to T_a = 873 K and that the formation of α-Fe₂O ₃ phase influences the change of magnetic properties in the Fe ₃O₄ film above T_a = 873K.

Original language	English
Pages (from-to)	175-178
Number of pages	4
Journal	Materials Transactions
Volume	49
Issue number	1
DOIs	https://doi.org/10.2320/matertrans.MRA2007200
Publication status	Published - 2008 Jan

Keywords

Annealing
Hematite
Magnetite
Saturation magnetization

ASJC Scopus subject areas

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

Access to Document

10.2320/matertrans.MRA2007200

Cite this

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title = "Change of magnetic properties and structure in Fe3O4 films on Si substrates with annealing temperature",

abstract = "We have investigated the magnetic properties and structure of Fe 3O4 films on Si substrates before and after annealing at various temperatures, Ta. The saturation magnetization and the coercivity in the Fe3O4 films are observed at all T a. They markedly increase with increasing Ta up to 873 K, and their values become maximum at Ta = 873 K. Furthermore, they slightly decrease above Ta = 873 K. The Fe3O4 phase mainly exists in the films at all Ta. In addition, the α-Fe2O3 phase (hematite) is also formed in the films above Ta = 873 K. On the basis of these results, it is found that the growth of Fe3O4 phase by annealing is mainly dominant in the change of magnetic properties in the Fe3O4 film up to Ta = 873 K and that the formation of α-Fe2O 3 phase influences the change of magnetic properties in the Fe 3O4 film above Ta = 873K.",

keywords = "Annealing, Hematite, Magnetite, Saturation magnetization",

author = "Sayeeduzzaman Syed and Yasushi Endo and Takanobu Sato and Yoshio Kawamura and Ryoichi Nakatani",

year = "2008",

month = jan,

doi = "10.2320/matertrans.MRA2007200",

language = "English",

volume = "49",

pages = "175--178",

journal = "Materials Transactions",

issn = "1345-9678",

publisher = "Japan Institute of Metals (JIM)",

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TY - JOUR

T1 - Change of magnetic properties and structure in Fe3O4 films on Si substrates with annealing temperature

AU - Syed, Sayeeduzzaman

AU - Endo, Yasushi

AU - Sato, Takanobu

AU - Kawamura, Yoshio

AU - Nakatani, Ryoichi

PY - 2008/1

Y1 - 2008/1

N2 - We have investigated the magnetic properties and structure of Fe 3O4 films on Si substrates before and after annealing at various temperatures, Ta. The saturation magnetization and the coercivity in the Fe3O4 films are observed at all T a. They markedly increase with increasing Ta up to 873 K, and their values become maximum at Ta = 873 K. Furthermore, they slightly decrease above Ta = 873 K. The Fe3O4 phase mainly exists in the films at all Ta. In addition, the α-Fe2O3 phase (hematite) is also formed in the films above Ta = 873 K. On the basis of these results, it is found that the growth of Fe3O4 phase by annealing is mainly dominant in the change of magnetic properties in the Fe3O4 film up to Ta = 873 K and that the formation of α-Fe2O 3 phase influences the change of magnetic properties in the Fe 3O4 film above Ta = 873K.

AB - We have investigated the magnetic properties and structure of Fe 3O4 films on Si substrates before and after annealing at various temperatures, Ta. The saturation magnetization and the coercivity in the Fe3O4 films are observed at all T a. They markedly increase with increasing Ta up to 873 K, and their values become maximum at Ta = 873 K. Furthermore, they slightly decrease above Ta = 873 K. The Fe3O4 phase mainly exists in the films at all Ta. In addition, the α-Fe2O3 phase (hematite) is also formed in the films above Ta = 873 K. On the basis of these results, it is found that the growth of Fe3O4 phase by annealing is mainly dominant in the change of magnetic properties in the Fe3O4 film up to Ta = 873 K and that the formation of α-Fe2O 3 phase influences the change of magnetic properties in the Fe 3O4 film above Ta = 873K.

KW - Annealing

KW - Hematite

KW - Magnetite

KW - Saturation magnetization

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