Proteresis in Co:CoO core-shell nanoclusters

被引：9

作者：

Wei, X. -H. ^{[1
]}

Skomski, R.

Sun, Z. -G.

Sellmyer, D. J.

机构：

[1] Univ Nebraska, Dept Phys & Astron, Lincoln, NE 68588 USA

[2] Univ Nebraska, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2008年 / 103卷 / 07期

关键词：

D O I：

10.1063/1.2829239

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The magnetism of ultrasmall Co:CoO core-shell nanoclusters is investigated. The structures, produced by cluster-beam deposition, have Co core sizes ranging from 1 to 7 nm and a CoO shell thickness of about 3 nm. Hysteresis loops as well as zero-field-cooled and field-cooled magnetization curves have been measured and a striking feature of the nanostructures is the existence of proteretic (clockwise) rather than hysteretic loops in the core-size range from 3 to 4 nm. The proteretic behavior and its particle-size dependence reflect a subtle interplay between various anisotropies and exchange interactions in the Co and CoO phases and at the Co-CoO interface.

引用

页数：3

共 20 条

[1]

Antony J, 2006, J NANOSCI NANOTECHNO, V6, P568, DOI 10.1166/jnn.2006.074

[2] INITIAL MAGNETIZATION, REMANENCE, AND COERCIVITY OF RANDOM ANISOTROPY AMORPHOUS FERROMAGNET [J].

CALLEN, E ;

LIU, YJ ;

CULLEN, JR .

PHYSICAL REVIEW B, 1977, 16 (01) :263-270

[3] Exchange bias and nanoparticle magnetic stability in Co-CoO composites [J].

De Toro, JA ;

Andrés, JP ;

González, JA ;

Muñiz, P ;

Muñoz, T ;

Normile, PS ;

Riveiro, JM .

PHYSICAL REVIEW B, 2006, 73 (09)

[4] Influence of finite size effects on exchange anisotropy in oxidized Co nanocluster assembled films [J].

Dobrynin, A. N. ;

Ievlev, D. N. ;

Hendrich, C. ;

Temst, K. ;

Lievens, P. ;

Hormann, U. ;

Verbeeck, J. ;

Van Tendeloo, G. ;

Vantomme, A. .

PHYSICAL REVIEW B, 2006, 73 (24)

[5] Structure and magnetic properties of exchange-spring Sm-Co/Co superlattices [J].

Fullerton, EE ;

Jiang, JS ;

Sowers, CH ;

Pearson, JE ;

Bader, SD .

APPLIED PHYSICS LETTERS, 1998, 72 (03) :380-382

[6] CLOCKWISE HYSTERESIS OR PROTERESIS [J].

GIRARD, P ;

BOISSEL, JP .

JOURNAL OF PHARMACOKINETICS AND BIOPHARMACEUTICS, 1989, 17 (03) :401-402

[7] High energy products in rapidly annealed nanoscale Fe/Pt multilayers [J].

Liu, JP ;

Luo, CP ;

Liu, Y ;

Sellmyer, DJ .

APPLIED PHYSICS LETTERS, 1998, 72 (04) :483-485

[8] NEW MAGNETIC ANISOTROPY [J].

MEIKLEJOHN, WH ;

BEAN, CP .

PHYSICAL REVIEW, 1956, 102 (05) :1413-1414

[9] Use of the anisotropic magnetoresistance to measure exchange anisotropy in Co/CoO bilayers [J].

Miller, BH ;

Dahlberg, ED .

APPLIED PHYSICS LETTERS, 1996, 69 (25) :3932-3934

[10] Reactive sputtering synthesis of Co-CoO/Ag nanogranular and multilayer films containing core-shell particles [J].

Munoz, T. ;

De Toro, J. A. ;

Normile, P. S. ;

Andres, J. P. ;

Gonzalez, J. A. ;

Muniz, P. ;

Barbero, A. J. ;

Riveiro, J. M. .

JOURNAL OF APPLIED PHYSICS, 2007, 101 (09)

← 1 2 →