The role of exchange coupling on the giant magnetoimpedance of annealed amorphous materials

Cheol Gi Kim; Chong Oh Kim; Seok Soo Yoon

doi:10.1016/S0304-8853(02)00546-2

The role of exchange coupling on the giant magnetoimpedance of annealed amorphous materials

Cheol Gi Kim
, Chong Oh Kim
, Seok Soo Yoon

Department of Physics and Chemistry

Research output: Contribution to journal › Conference article › peer-review

20 Scopus citations

Abstract

The characteristics of giant magnetoimpedance (GMI) profiles were measured in annealed amorphous Co₆₆Fe₄B₁₅Si₁₅ ribbons in the open air as functions of annealing time, temperature and field. The GMI profile measured at 0.1 MHz exhibits a drastic step-like change, the so-called "GMI-valve" in samples produced with the optimum annealing parameters: time t_a ≥ 8 h, temperature T_a ≈ 380°C and in the weak-field range, 0.5 Oe ≤ H_a ≤ 3 Oe. The GMI-valve is related to an exchange coupling of a bias-field with the magnetization of the soft amorphous phase, where the bias-field is caused by HCP-Co, FCC-Co and/or Co₂Si crystalline phases in a B and Si depleted layer.

Original language	English
Pages (from-to)	293-299
Number of pages	7
Journal	Journal of Magnetism and Magnetic Materials
Volume	249
Issue number	1-2
DOIs	https://doi.org/10.1016/S0304-8853(02)00546-2
State	Published - Aug 2002
Event	International Workshop on Magnetic Wires - San Sebastian, Spain Duration: 20 Jun 2001 → 22 Jun 2001

Bibliographical note

Funding Information:
This work was supported by the Korean Science and Engineering Foundation through the Research Center for Advanced Magnetic Materials at Chungnam National University.

Keywords

Amorphous
Asymmetric GMI
Bias-field
Exchange coupling

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10.1016/S0304-8853(02)00546-2

Cite this

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title = "The role of exchange coupling on the giant magnetoimpedance of annealed amorphous materials",

abstract = "The characteristics of giant magnetoimpedance (GMI) profiles were measured in annealed amorphous Co66Fe4B15Si15 ribbons in the open air as functions of annealing time, temperature and field. The GMI profile measured at 0.1 MHz exhibits a drastic step-like change, the so-called {"}GMI-valve{"} in samples produced with the optimum annealing parameters: time ta ≥ 8 h, temperature Ta ≈ 380°C and in the weak-field range, 0.5 Oe ≤ Ha ≤ 3 Oe. The GMI-valve is related to an exchange coupling of a bias-field with the magnetization of the soft amorphous phase, where the bias-field is caused by HCP-Co, FCC-Co and/or Co2Si crystalline phases in a B and Si depleted layer.",

keywords = "Amorphous, Asymmetric GMI, Bias-field, Exchange coupling",

author = "Kim, \{Cheol Gi\} and Kim, \{Chong Oh\} and Yoon, \{Seok Soo\}",

note = "Funding Information: This work was supported by the Korean Science and Engineering Foundation through the Research Center for Advanced Magnetic Materials at Chungnam National University.; International Workshop on Magnetic Wires ; Conference date: 20-06-2001 Through 22-06-2001",

year = "2002",

month = aug,

doi = "10.1016/S0304-8853(02)00546-2",

language = "English",

volume = "249",

pages = "293--299",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier B.V.",

number = "1-2",

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TY - JOUR

T1 - The role of exchange coupling on the giant magnetoimpedance of annealed amorphous materials

AU - Kim, Cheol Gi

AU - Kim, Chong Oh

AU - Yoon, Seok Soo

N1 - Funding Information: This work was supported by the Korean Science and Engineering Foundation through the Research Center for Advanced Magnetic Materials at Chungnam National University.

PY - 2002/8

Y1 - 2002/8

N2 - The characteristics of giant magnetoimpedance (GMI) profiles were measured in annealed amorphous Co66Fe4B15Si15 ribbons in the open air as functions of annealing time, temperature and field. The GMI profile measured at 0.1 MHz exhibits a drastic step-like change, the so-called "GMI-valve" in samples produced with the optimum annealing parameters: time ta ≥ 8 h, temperature Ta ≈ 380°C and in the weak-field range, 0.5 Oe ≤ Ha ≤ 3 Oe. The GMI-valve is related to an exchange coupling of a bias-field with the magnetization of the soft amorphous phase, where the bias-field is caused by HCP-Co, FCC-Co and/or Co2Si crystalline phases in a B and Si depleted layer.

AB - The characteristics of giant magnetoimpedance (GMI) profiles were measured in annealed amorphous Co66Fe4B15Si15 ribbons in the open air as functions of annealing time, temperature and field. The GMI profile measured at 0.1 MHz exhibits a drastic step-like change, the so-called "GMI-valve" in samples produced with the optimum annealing parameters: time ta ≥ 8 h, temperature Ta ≈ 380°C and in the weak-field range, 0.5 Oe ≤ Ha ≤ 3 Oe. The GMI-valve is related to an exchange coupling of a bias-field with the magnetization of the soft amorphous phase, where the bias-field is caused by HCP-Co, FCC-Co and/or Co2Si crystalline phases in a B and Si depleted layer.

KW - Amorphous

KW - Asymmetric GMI

KW - Bias-field

KW - Exchange coupling

UR - https://www.scopus.com/pages/publications/0036701322

U2 - 10.1016/S0304-8853(02)00546-2

DO - 10.1016/S0304-8853(02)00546-2

M3 - Conference article

AN - SCOPUS:0036701322

SN - 0304-8853

VL - 249

SP - 293

EP - 299

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 1-2

T2 - International Workshop on Magnetic Wires

Y2 - 20 June 2001 through 22 June 2001

ER -

The role of exchange coupling on the giant magnetoimpedance of annealed amorphous materials

Abstract

Bibliographical note

Keywords

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