Role of bottom layer of double recording layer structure for antiferromagnetically coupled longitudinal media

T. Q. Li; D. Hasegawa; S. Saito; H. Ohyama; M. Imakawa; Migaku Takahashi

doi:10.1109/TMAG.2006.878244

Role of bottom layer of double recording layer structure for antiferromagnetically coupled longitudinal media

T. Q. Li, D. Hasegawa, S. Saito, H. Ohyama, M. Imakawa, Migaku Takahashi

ENG - Electronic Engineering

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

Abstract

Double recording layers stacked on a Ru spacing layer are commonly used to obtain good recording properties for antiferromagnetically coupled (AFC) longitudinal media. In this paper, we report on a study that clarified the role of the bottom recording layer (BRL). We measured physical magnetic properties such as magnetic anisotropy field (H_k), magnetocrystalline anisotropy energy (K_u), intergranular interaction, and thermal agitation of the AFC media, with and without BRL. Results showed that: 1) even a thin BRL (1 nm thick) significantly increases remanent coercivity H_cr; 2) this increase in H_k is mainly caused by an increase in H_k due to elimination of the low K_u region at the bottom portion of the top recording layer; and 3) judging from magnetic cluster size, insertion of a BRL can reduce the intergranular exchange coupling at the initial growth region of the recording layer.

Original language	English
Article number	1678067
Pages (from-to)	2215-2217
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	42
Issue number	9
DOIs	https://doi.org/10.1109/TMAG.2006.878244
Publication status	Published - 2006 Sep 1

Keywords

AFC
Double recording layer
Intergranular exchange coupling
Magnetic anisotropy field
Remanent coercivity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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title = "Role of bottom layer of double recording layer structure for antiferromagnetically coupled longitudinal media",

abstract = "Double recording layers stacked on a Ru spacing layer are commonly used to obtain good recording properties for antiferromagnetically coupled (AFC) longitudinal media. In this paper, we report on a study that clarified the role of the bottom recording layer (BRL). We measured physical magnetic properties such as magnetic anisotropy field (Hk), magnetocrystalline anisotropy energy (Ku), intergranular interaction, and thermal agitation of the AFC media, with and without BRL. Results showed that: 1) even a thin BRL (1 nm thick) significantly increases remanent coercivity Hcr; 2) this increase in Hk is mainly caused by an increase in Hk due to elimination of the low Ku region at the bottom portion of the top recording layer; and 3) judging from magnetic cluster size, insertion of a BRL can reduce the intergranular exchange coupling at the initial growth region of the recording layer.",

keywords = "AFC, Double recording layer, Intergranular exchange coupling, Magnetic anisotropy field, Remanent coercivity",

author = "Li, {T. Q.} and D. Hasegawa and S. Saito and H. Ohyama and M. Imakawa and Migaku Takahashi",

year = "2006",

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doi = "10.1109/TMAG.2006.878244",

language = "English",

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TY - JOUR

T1 - Role of bottom layer of double recording layer structure for antiferromagnetically coupled longitudinal media

AU - Li, T. Q.

AU - Hasegawa, D.

AU - Saito, S.

AU - Ohyama, H.

AU - Imakawa, M.

AU - Takahashi, Migaku

PY - 2006/9/1

Y1 - 2006/9/1

N2 - Double recording layers stacked on a Ru spacing layer are commonly used to obtain good recording properties for antiferromagnetically coupled (AFC) longitudinal media. In this paper, we report on a study that clarified the role of the bottom recording layer (BRL). We measured physical magnetic properties such as magnetic anisotropy field (Hk), magnetocrystalline anisotropy energy (Ku), intergranular interaction, and thermal agitation of the AFC media, with and without BRL. Results showed that: 1) even a thin BRL (1 nm thick) significantly increases remanent coercivity Hcr; 2) this increase in Hk is mainly caused by an increase in Hk due to elimination of the low Ku region at the bottom portion of the top recording layer; and 3) judging from magnetic cluster size, insertion of a BRL can reduce the intergranular exchange coupling at the initial growth region of the recording layer.

AB - Double recording layers stacked on a Ru spacing layer are commonly used to obtain good recording properties for antiferromagnetically coupled (AFC) longitudinal media. In this paper, we report on a study that clarified the role of the bottom recording layer (BRL). We measured physical magnetic properties such as magnetic anisotropy field (Hk), magnetocrystalline anisotropy energy (Ku), intergranular interaction, and thermal agitation of the AFC media, with and without BRL. Results showed that: 1) even a thin BRL (1 nm thick) significantly increases remanent coercivity Hcr; 2) this increase in Hk is mainly caused by an increase in Hk due to elimination of the low Ku region at the bottom portion of the top recording layer; and 3) judging from magnetic cluster size, insertion of a BRL can reduce the intergranular exchange coupling at the initial growth region of the recording layer.

KW - AFC

KW - Double recording layer

KW - Intergranular exchange coupling

KW - Magnetic anisotropy field

KW - Remanent coercivity

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