Particle size effects and surface anisotropy in Fe-based granular films

被引：85

作者：

Chen, C ^{[1
]}

Kitakami, O ^{[1
]}

Shimada, Y ^{[1
]}

机构：

[1] Tohoku Univ, Sci Measurements Res Inst, Sendai, Miyagi 9808577, Japan

来源：

JOURNAL OF APPLIED PHYSICS | 1998年 / 84卷 / 04期

关键词：

D O I：

10.1063/1.368281

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Structure and magnetic properties of Fe/SiO2 and Fe/Al2O3 granular films were studied in the particle size (d) range of 1-50 nm. The coercivity (H-c) shows a maximum around 600 Oe at the particle size dm approximate to 18 nm, and then decreases in the larger particle size range for both Fe/SiO2 and Fe/Al2O3 systems at room temperature. A relation of coercivity, particle size, and temperature was built by using the Neel-Brown theory and the Stoner-Wohlfarth model basically. The experimental results were successfully fitted by assuming that the alpha-Fe particles possess uniaxial surface anisotropy K-s approximate to 0.4 erg/cm(2). (C) 1998 American Institute of Physics. [S0021-8979(98)01916-1].

引用

页码：2184 / 2188

页数：5

共 28 条

[21] MAGNETIC AND STRUCTURAL-PROPERTIES OF CONIPT(SIO2) ALLOY-FILMS FOR HIGH-DENSITY LONGITUDINAL RECORDING [J].

MURAYAMA, A ;

MIYAMURA, M ;

KONDOH, S .

JOURNAL OF APPLIED PHYSICS, 1994, 76 (09) :5361-5370

[22]

Neel L., 1949, Ann. Geophys. (C.N.R.S.), V5, P99, DOI DOI 10.1016/S0009-2509(00)00427-9

[23] DETERMINATION OF ANISOTROPY-FIELD DISTRIBUTION IN PARTICLE ASSEMBLIES TAKING INTO ACCOUNT THERMAL FLUCTUATIONS [J].

PFEIFFER, H .

PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, 1990, 118 (01) :295-306

[24] PARTICLE-SIZE EFFECTS ON THE SWITCHING BEHAVIOR OF UNIAXIAL AND MULTIAXIAL MAGNETIC RECORDING MATERIALS [J].

SHARROCK, MP .

IEEE TRANSACTIONS ON MAGNETICS, 1984, 20 (05) :754-756

[25]

SOHL H, 1997, J APPL PHYS, V82, P6128

[26] A MECHANISM OF MAGNETIC HYSTERESIS IN HETEROGENEOUS ALLOYS [J].

STONER, EC ;

WOHLFARTH, EP .

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1948, 240 (826) :599-642

[27] FERROMAGNETIC-RESONANCE IN ULTRAHIGH-VACUUM OF BCC FE(001) FILMS GROWN ON AG(001) [J].

URQUHART, KB ;

HEINRICH, B ;

COCHRAN, JF ;

ARROTT, AS ;

MYRTLE, K .

JOURNAL OF APPLIED PHYSICS, 1988, 64 (10) :5334-5336

[28] GIANT MAGNETIC COERCIVITY AND PERCOLATION EFFECTS IN ANTIGRANULOCYTES FE-(SIO2) SOLIDS [J].

XIAO, G ;

CHIEN, CL .

APPLIED PHYSICS LETTERS, 1987, 51 (16) :1280-1282

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