Reversal field versus pulse time: Theoretical and experimental comparison

被引：14

作者：

Bertram, HN ^{[1
]}

Safonov, VL ^{[1
]}

机构：

[1] Univ Calif San Diego, Ctr Magnet Recording Res, La Jolla, CA 92093 USA

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2000年 / 36卷 / 05期

关键词：

magnetization dynamics; reversal time; thermal fluctuations;

D O I：

10.1109/20.908462

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A new model of reversal field versus pulse time is used to analyze measurements on elongated particles in magnetic tape. The model applies to all times and temperatures and fits the data extremely well. At long times the model agrees with simple N\'{e}el-Arrhenius models, but for times less than about 0.1 ms exhibits a progressively increasing switching field. This increase is shown to be due initially to a field dependent attempt frequency. At extremely short times dynamic processes dominate and in this regime the best estimate of the damping constant is obtained. The model gives values of effective volume and anisotropy that are in agrement with nonuniform reversal in these particles.

引用

页码：2447 / 2449

页数：3

共 5 条

[1]

Bertram HN, 1999, J MAGN MAGN MATER, V193, P388, DOI 10.1016/S0304-8853(98)00519-8

[2] THERMAL FLUCTUATIONS OF A SINGLE-DOMAIN PARTICLE [J].

BROWN, WF .

PHYSICAL REVIEW, 1963, 130 (05) :1677-+

[3]

SAFONOV VL, 2000, J APPL PHYS, V87

[4] TIME-DEPENDENCE OF SWITCHING FIELDS IN MAGNETIC RECORDING MEDIA (INVITED) [J].

SHARROCK, MP .

JOURNAL OF APPLIED PHYSICS, 1994, 76 (10) :6413-6418

[5] The relationship between the dynamic remanent coercivity and the viscosity and irreversible susceptibility in magnetic media [J].

Stinnett, SM ;

Harrell, JW ;

Khapikov, AF ;

Doyle, WD .

IEEE TRANSACTIONS ON MAGNETICS, 2000, 36 (01) :148-153

← 1 →