Surface contribution to the anisotropy of magnetic nanoparticles

被引：197

作者：

Garanin, DA ^{[1
]}

Kachkachi, H

机构：

[1] Univ Mainz, Inst Phys, D-55099 Mainz, Germany

[2] Univ Versailles, Lab Magnetisme & Opt, F-78035 Versailles, France

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.90.065504

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We calculate the contribution of the Neel surface anisotropy to the effective anisotropy of magnetic nanoparticles of spherical shape cut out of a simple cubic lattice. The effective anisotropy arises because deviations of atomic magnetizations from collinearity and thus the energy depends on the orientation of the global magnetization. The result is second order in the Neel surface anisotropy, scales with the particle's volume, and has cubic symmetry with preferred directions [+/-1, +/-1, +/-1].

引用

收藏

页数：4

相关论文

共 12 条

[1] Surface anisotropy in giant magnetic coercivity effect of cubic granular FeCo/SiO2 and NiCo/SiO2 films:: A comparison with Neel's theory [J].

Chen, C ;

Kitakami, O ;

Okamoto, S ;

Shimada, Y .

JOURNAL OF APPLIED PHYSICS, 1999, 86 (04) :2161-2165

[2] SURFACE AND STEP MAGNETIC-ANISOTROPY [J].

CHUANG, DS ;

BALLENTINE, CA ;

OHANDLEY, RC .

PHYSICAL REVIEW B, 1994, 49 (21) :15084-15095

[3] Effect of surface anisotropy on the hysteretic properties of a magnetic particle [J].

Dimian, M ;

Kachkachi, H .

JOURNAL OF APPLIED PHYSICS, 2002, 91 (10) :7625-7627

[4] EFFECTS OF SURFACE ANISOTROPY ON HYSTERESIS IN FINE MAGNETIC PARTICLES [J].

DIMITROV, DA ;

WYSIN, GM .

PHYSICAL REVIEW B, 1994, 50 (05) :3077-3084

[5] MAGNETIC-PROPERTIES OF SPHERICAL FCC CLUSTERS WITH RADIAL SURFACE ANISOTROPY [J].

DIMITROV, DA ;

WYSIN, GM .

PHYSICAL REVIEW B, 1995, 51 (17) :11947-11950

[6] Thermally activated escape rates of uniaxial spin systems with transverse field: Uniaxial crossovers [J].

Garanin, DA ;

Kennedy, EC ;

Crothers, DSF ;

Coffey, WT .

PHYSICAL REVIEW E, 1999, 60 (06) :6499-6502

[7] Magnetic anisotropy of a single cobalt nanocluster [J].

Jamet, M ;

Wernsdorfer, W ;

Thirion, C ;

Mailly, D ;

Dupuis, V ;

Mélinon, P ;

Pérez, A .

PHYSICAL REVIEW LETTERS, 2001, 86 (20) :4676-4679

[8] Hysteretic properties of a magnetic particle with strong surface anisotropy [J].

Kachkachi, H ;

Dimian, M .

PHYSICAL REVIEW B, 2002, 66 (17) :1-11

[9] Surface anisotropy in ferromagnetic nanoparticles [J].

Labaye, Y ;

Crisan, O ;

Berger, L ;

Greneche, JM ;

Coey, JMD .

JOURNAL OF APPLIED PHYSICS, 2002, 91 (10) :8715-8717

[10]

Neel L., 1954, J PHYS RADIUM, V15, P255