Production of a magnetic material with the ability to change from very soft to semi-hard magnetic

Yan Zhang; Parmanand Sharma; Noriharu Yodoshi; Akihiro Makino

doi:10.1063/1.4916812

Production of a magnetic material with the ability to change from very soft to semi-hard magnetic

Yan Zhang, Parmanand Sharma, Noriharu Yodoshi, Akihiro Makino

HOSP - Sense Organs and Rehabilitation Medicine

Tohoku University

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

1 Citation (Scopus)

Abstract

Development and magnetic properties of an alloy that can change from very soft to semi-hard magnetic are reported. We found that as quenched ribbons of Fe_75.3Pt₈B₁₂P₄Cu_0.7 alloy are amorphous by X-ray. Heat treatment in the temperature range of 400-450°C causes formation of many α-Fe grains in the amorphous matrix. Hard magnetic L1₀ FePt grains appear at ∼520°C. This alloy shows a high saturation magnetic flux density [B_s (≈ M_s)>1.55T] along with the ability to vary coercivity (H_c) from ∼25A/m to 11000A/m. The H_c can be increased further to more than 21000A/m, but at the expense of a significant decrease in B_s. The ability to control magnetic properties lies in a precise control over the soft and hard magnetic phases, which are strongly exchange coupled.

Original language	English
Article number	17E507
Journal	Journal of Applied Physics
Volume	117
Issue number	17
DOIs	https://doi.org/10.1063/1.4916812
Publication status	Published - 2015 May 7

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title = "Production of a magnetic material with the ability to change from very soft to semi-hard magnetic",

abstract = "Development and magnetic properties of an alloy that can change from very soft to semi-hard magnetic are reported. We found that as quenched ribbons of Fe75.3Pt8B12P4Cu0.7 alloy are amorphous by X-ray. Heat treatment in the temperature range of 400-450°C causes formation of many α-Fe grains in the amorphous matrix. Hard magnetic L10 FePt grains appear at ∼520°C. This alloy shows a high saturation magnetic flux density [Bs (≈ Ms)>1.55T] along with the ability to vary coercivity (Hc) from ∼25A/m to 11000A/m. The Hc can be increased further to more than 21000A/m, but at the expense of a significant decrease in Bs. The ability to control magnetic properties lies in a precise control over the soft and hard magnetic phases, which are strongly exchange coupled.",

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AU - Sharma, Parmanand

AU - Yodoshi, Noriharu

AU - Makino, Akihiro

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N2 - Development and magnetic properties of an alloy that can change from very soft to semi-hard magnetic are reported. We found that as quenched ribbons of Fe75.3Pt8B12P4Cu0.7 alloy are amorphous by X-ray. Heat treatment in the temperature range of 400-450°C causes formation of many α-Fe grains in the amorphous matrix. Hard magnetic L10 FePt grains appear at ∼520°C. This alloy shows a high saturation magnetic flux density [Bs (≈ Ms)>1.55T] along with the ability to vary coercivity (Hc) from ∼25A/m to 11000A/m. The Hc can be increased further to more than 21000A/m, but at the expense of a significant decrease in Bs. The ability to control magnetic properties lies in a precise control over the soft and hard magnetic phases, which are strongly exchange coupled.

AB - Development and magnetic properties of an alloy that can change from very soft to semi-hard magnetic are reported. We found that as quenched ribbons of Fe75.3Pt8B12P4Cu0.7 alloy are amorphous by X-ray. Heat treatment in the temperature range of 400-450°C causes formation of many α-Fe grains in the amorphous matrix. Hard magnetic L10 FePt grains appear at ∼520°C. This alloy shows a high saturation magnetic flux density [Bs (≈ Ms)>1.55T] along with the ability to vary coercivity (Hc) from ∼25A/m to 11000A/m. The Hc can be increased further to more than 21000A/m, but at the expense of a significant decrease in Bs. The ability to control magnetic properties lies in a precise control over the soft and hard magnetic phases, which are strongly exchange coupled.

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Production of a magnetic material with the ability to change from very soft to semi-hard magnetic

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