Magnetic properties and microstructure of the granular films processed by annealing FePt-based multilayers

T. O. Seki; Y. K. Takahashi; K. Hono

doi:10.1109/TMAG.2005.854693

Magnetic properties and microstructure of the granular films processed by annealing FePt-based multilayers

T. O. Seki, Y. K. Takahashi, K. Hono

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

4 Citations (Scopus)

Abstract

To explore the possibility of FePt-based soft/hard nanocomposite magnets, granular films were prepared by annealing Pt/Fe, FePt/Fe, and FePt/Fe ₃Pt multilayers. Although a high coercivity of 12 kOe was obtained by annealing the Fe₃Pt/FePt multilayers, only a small remanence was obtained due to random orientation of L1₀ FePt grains. By introducing oxygen during the film deposition, a few nanometer oxide particles were observed within the FePt grains and H_c increased at the expense of M_r. A possible way to achieve a higher value of (BH)_max is discussed based on the relationship between the microstructure and magnetic properties.

Original language	English
Pages (from-to)	3799-3801
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	41
Issue number	10
DOIs	https://doi.org/10.1109/TMAG.2005.854693
Publication status	Published - 2005 Oct
Externally published	Yes

Keywords

Coercivity
Energy product
Exchange coupling
Multilayer
Nanocomposite magnets

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2005.854693

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title = "Magnetic properties and microstructure of the granular films processed by annealing FePt-based multilayers",

abstract = "To explore the possibility of FePt-based soft/hard nanocomposite magnets, granular films were prepared by annealing Pt/Fe, FePt/Fe, and FePt/Fe 3Pt multilayers. Although a high coercivity of 12 kOe was obtained by annealing the Fe3Pt/FePt multilayers, only a small remanence was obtained due to random orientation of L10 FePt grains. By introducing oxygen during the film deposition, a few nanometer oxide particles were observed within the FePt grains and Hc increased at the expense of Mr. A possible way to achieve a higher value of (BH)max is discussed based on the relationship between the microstructure and magnetic properties.",

keywords = "Coercivity, Energy product, Exchange coupling, Multilayer, Nanocomposite magnets",

author = "Seki, {T. O.} and Takahashi, {Y. K.} and K. Hono",

year = "2005",

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doi = "10.1109/TMAG.2005.854693",

language = "English",

volume = "41",

pages = "3799--3801",

journal = "IEEE Transactions on Magnetics",

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T1 - Magnetic properties and microstructure of the granular films processed by annealing FePt-based multilayers

AU - Seki, T. O.

AU - Takahashi, Y. K.

AU - Hono, K.

PY - 2005/10

Y1 - 2005/10

N2 - To explore the possibility of FePt-based soft/hard nanocomposite magnets, granular films were prepared by annealing Pt/Fe, FePt/Fe, and FePt/Fe 3Pt multilayers. Although a high coercivity of 12 kOe was obtained by annealing the Fe3Pt/FePt multilayers, only a small remanence was obtained due to random orientation of L10 FePt grains. By introducing oxygen during the film deposition, a few nanometer oxide particles were observed within the FePt grains and Hc increased at the expense of Mr. A possible way to achieve a higher value of (BH)max is discussed based on the relationship between the microstructure and magnetic properties.

AB - To explore the possibility of FePt-based soft/hard nanocomposite magnets, granular films were prepared by annealing Pt/Fe, FePt/Fe, and FePt/Fe 3Pt multilayers. Although a high coercivity of 12 kOe was obtained by annealing the Fe3Pt/FePt multilayers, only a small remanence was obtained due to random orientation of L10 FePt grains. By introducing oxygen during the film deposition, a few nanometer oxide particles were observed within the FePt grains and Hc increased at the expense of Mr. A possible way to achieve a higher value of (BH)max is discussed based on the relationship between the microstructure and magnetic properties.

KW - Coercivity

KW - Energy product

KW - Exchange coupling

KW - Multilayer

KW - Nanocomposite magnets

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JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

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Magnetic properties and microstructure of the granular films processed by annealing FePt-based multilayers

Abstract

Keywords

ASJC Scopus subject areas

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