Micromagnetic Studies at Finite Temperature on FePt-C Granular Films

Junjie Song; J. Wang; Dan Wei; Y. K. Takahashi; K. Hono

doi:10.1109/TMAG.2017.2719019

Micromagnetic Studies at Finite Temperature on FePt-C Granular Films

Junjie Song, J. Wang, Dan Wei^*, Y. K. Takahashi, K. Hono

^*Corresponding author for this work

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

6 Citations (Scopus)

Abstract

A new micromagnetic method using the hybrid Monte Carlo (HMC) algorithm has been developed, and the magnetic properties at finite temperature can be simulated. In this paper, the HMC micromagnetics are applied on the polycrystalline FePt-C granular films for heat-assisted magnetic recording, where the significant parameters such as the temperature-dependent saturation magnetization M_s(T) are measured by experiments. The Voronoi polycrystalline microstructure is built upon a regular mesh of micromagnetic cells. The magnetization (M-H) loops below the Curie temperature are calculated; they agree well with experiments at 300, 400, 500, and 600 K, respectively, which have confirmed the validity of the HMC micromagnetic method. Besides, the M-H loop at 700 K, which currently cannot be measured by experiments, can also be simulated using the HMC algorithm, which shows superparamagnetic properties.

Original language	English
Article number	7956263
Journal	IEEE Transactions on Magnetics
Volume	53
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2017.2719019
Publication status	Published - 2017 Nov
Externally published	Yes

Keywords

Fept-C
finite temperature
heat-assisted magnetic recording (HAMR)
hybrid Monte Carlo (HMC)
m-h loops
micromagnetics
superparamagnetic

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2017.2719019

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title = "Micromagnetic Studies at Finite Temperature on FePt-C Granular Films",

abstract = "A new micromagnetic method using the hybrid Monte Carlo (HMC) algorithm has been developed, and the magnetic properties at finite temperature can be simulated. In this paper, the HMC micromagnetics are applied on the polycrystalline FePt-C granular films for heat-assisted magnetic recording, where the significant parameters such as the temperature-dependent saturation magnetization Ms(T) are measured by experiments. The Voronoi polycrystalline microstructure is built upon a regular mesh of micromagnetic cells. The magnetization (M-H) loops below the Curie temperature are calculated; they agree well with experiments at 300, 400, 500, and 600 K, respectively, which have confirmed the validity of the HMC micromagnetic method. Besides, the M-H loop at 700 K, which currently cannot be measured by experiments, can also be simulated using the HMC algorithm, which shows superparamagnetic properties.",

keywords = "Fept-C, finite temperature, heat-assisted magnetic recording (HAMR), hybrid Monte Carlo (HMC), m-h loops, micromagnetics, superparamagnetic",

author = "Junjie Song and J. Wang and Dan Wei and Takahashi, {Y. K.} and K. Hono",

note = "Publisher Copyright: {\textcopyright} 1965-2012 IEEE.",

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AU - Song, Junjie

AU - Wang, J.

AU - Wei, Dan

AU - Takahashi, Y. K.

AU - Hono, K.

PY - 2017/11

Y1 - 2017/11

N2 - A new micromagnetic method using the hybrid Monte Carlo (HMC) algorithm has been developed, and the magnetic properties at finite temperature can be simulated. In this paper, the HMC micromagnetics are applied on the polycrystalline FePt-C granular films for heat-assisted magnetic recording, where the significant parameters such as the temperature-dependent saturation magnetization Ms(T) are measured by experiments. The Voronoi polycrystalline microstructure is built upon a regular mesh of micromagnetic cells. The magnetization (M-H) loops below the Curie temperature are calculated; they agree well with experiments at 300, 400, 500, and 600 K, respectively, which have confirmed the validity of the HMC micromagnetic method. Besides, the M-H loop at 700 K, which currently cannot be measured by experiments, can also be simulated using the HMC algorithm, which shows superparamagnetic properties.

AB - A new micromagnetic method using the hybrid Monte Carlo (HMC) algorithm has been developed, and the magnetic properties at finite temperature can be simulated. In this paper, the HMC micromagnetics are applied on the polycrystalline FePt-C granular films for heat-assisted magnetic recording, where the significant parameters such as the temperature-dependent saturation magnetization Ms(T) are measured by experiments. The Voronoi polycrystalline microstructure is built upon a regular mesh of micromagnetic cells. The magnetization (M-H) loops below the Curie temperature are calculated; they agree well with experiments at 300, 400, 500, and 600 K, respectively, which have confirmed the validity of the HMC micromagnetic method. Besides, the M-H loop at 700 K, which currently cannot be measured by experiments, can also be simulated using the HMC algorithm, which shows superparamagnetic properties.

KW - Fept-C

KW - finite temperature

KW - heat-assisted magnetic recording (HAMR)

KW - hybrid Monte Carlo (HMC)

KW - m-h loops

KW - micromagnetics

KW - superparamagnetic

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Micromagnetic Studies at Finite Temperature on FePt-C Granular Films

Abstract

Keywords

ASJC Scopus subject areas

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