Magnetic anisotropy and behaviors of Fe nanoparticles

Takahiro Ibusuki; Seijyu Kojima; Osamu Kitakami; Yutaka Shimada

doi:10.1109/20.951130

Magnetic anisotropy and behaviors of Fe nanoparticles

Takahiro Ibusuki, Seijyu Kojima, Osamu Kitakami, Yutaka Shimada

Division of Inorganic Material Research

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

66 Citations (Scopus)

Abstract

We have studied the magnetic properties of bcc-Fe fine particles With a diameter D of 3 ∼ 40 nm prepared by a vapor condensation process. The particles exhibit uniaxial anisotropy of 2.0 ∼ 3.0 × 10⁶ erg/cc which is much larger than that of bulk Fe (0.5 × 10⁶ erg/cc). Numerical calculations taking into account dipolar interaction and thermal agitation reproduce the particle size dependence of coercivity very well. According to the present work, magnetization reversal of Fe particles proceeds via coherent rotation for D < 15 ∼ 20 nm and via incoherent rotation for D > 15 ∼ 20 nm. It is, however, still uncertain why the magnetic anisotropy of Fe fine particles is uniaxial and so large.

Original language	English
Pages (from-to)	2223-2225
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	37
Issue number	4
DOIs	https://doi.org/10.1109/20.951130
Publication status	Published - 2001 Jul

Keywords

Coercivity
Dipolar interaction
Fe
Fine particle
Magnetic anisotropy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/20.951130

Fingerprint Dive into the research topics of 'Magnetic anisotropy and behaviors of Fe nanoparticles'. Together they form a unique fingerprint.

Cite this

@article{9f097fdecfc54cbe810fe0e1eee13d75,

title = "Magnetic anisotropy and behaviors of Fe nanoparticles",

abstract = "We have studied the magnetic properties of bcc-Fe fine particles With a diameter D of 3 ∼ 40 nm prepared by a vapor condensation process. The particles exhibit uniaxial anisotropy of 2.0 ∼ 3.0 × 106 erg/cc which is much larger than that of bulk Fe (0.5 × 106 erg/cc). Numerical calculations taking into account dipolar interaction and thermal agitation reproduce the particle size dependence of coercivity very well. According to the present work, magnetization reversal of Fe particles proceeds via coherent rotation for D < 15 ∼ 20 nm and via incoherent rotation for D > 15 ∼ 20 nm. It is, however, still uncertain why the magnetic anisotropy of Fe fine particles is uniaxial and so large.",

keywords = "Coercivity, Dipolar interaction, Fe, Fine particle, Magnetic anisotropy",

author = "Takahiro Ibusuki and Seijyu Kojima and Osamu Kitakami and Yutaka Shimada",

note = "Funding Information: Manuscript received October 16, 2000. This work was supported by the Research for The Future Program of Japan Society for the Promotion of Science under Grant 97R14701, and Storage Research Consortium in Japan. The authors are with the Research Institute for Scientific Measurements, To-hoku University, 980-8577 Sendai, Japan (e-mail: ibusuki@rism.tohoku.ac.jp). Publisher Item Identifier S 0018-9464(01)06559-1.",

year = "2001",

month = jul,

doi = "10.1109/20.951130",

language = "English",

volume = "37",

pages = "2223--2225",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "4",

}

TY - JOUR

T1 - Magnetic anisotropy and behaviors of Fe nanoparticles

AU - Ibusuki, Takahiro

AU - Kojima, Seijyu

AU - Kitakami, Osamu

AU - Shimada, Yutaka

N1 - Funding Information: Manuscript received October 16, 2000. This work was supported by the Research for The Future Program of Japan Society for the Promotion of Science under Grant 97R14701, and Storage Research Consortium in Japan. The authors are with the Research Institute for Scientific Measurements, To-hoku University, 980-8577 Sendai, Japan (e-mail: ibusuki@rism.tohoku.ac.jp). Publisher Item Identifier S 0018-9464(01)06559-1.

PY - 2001/7

Y1 - 2001/7

N2 - We have studied the magnetic properties of bcc-Fe fine particles With a diameter D of 3 ∼ 40 nm prepared by a vapor condensation process. The particles exhibit uniaxial anisotropy of 2.0 ∼ 3.0 × 106 erg/cc which is much larger than that of bulk Fe (0.5 × 106 erg/cc). Numerical calculations taking into account dipolar interaction and thermal agitation reproduce the particle size dependence of coercivity very well. According to the present work, magnetization reversal of Fe particles proceeds via coherent rotation for D < 15 ∼ 20 nm and via incoherent rotation for D > 15 ∼ 20 nm. It is, however, still uncertain why the magnetic anisotropy of Fe fine particles is uniaxial and so large.

AB - We have studied the magnetic properties of bcc-Fe fine particles With a diameter D of 3 ∼ 40 nm prepared by a vapor condensation process. The particles exhibit uniaxial anisotropy of 2.0 ∼ 3.0 × 106 erg/cc which is much larger than that of bulk Fe (0.5 × 106 erg/cc). Numerical calculations taking into account dipolar interaction and thermal agitation reproduce the particle size dependence of coercivity very well. According to the present work, magnetization reversal of Fe particles proceeds via coherent rotation for D < 15 ∼ 20 nm and via incoherent rotation for D > 15 ∼ 20 nm. It is, however, still uncertain why the magnetic anisotropy of Fe fine particles is uniaxial and so large.

KW - Coercivity

KW - Dipolar interaction

KW - Fe

KW - Fine particle

KW - Magnetic anisotropy

UR - http://www.scopus.com/inward/record.url?scp=0035386345&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035386345&partnerID=8YFLogxK

U2 - 10.1109/20.951130

DO - 10.1109/20.951130

M3 - Article

AN - SCOPUS:0035386345

VL - 37

SP - 2223

EP - 2225

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

SN - 0018-9464

IS - 4

ER -

Magnetic anisotropy and behaviors of Fe nanoparticles

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Cite this