Spin rotation in α-Fe2O3 nanoparticles by interparticle interactions -: art. no. 027202

被引：82

作者：

Frandsen, C ^{[1
]}

Morup, S ^{[1
]}

机构：

[1] Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.94.027202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Nanoparticles of alpha-Fe2O3 (hematite) typically have the sublattice magnetization directions in the hexagonal (001) plane below the Neel temperature. By use of Mossbauer spectroscopy we have found that for agglomerated particles the sublattice magnetization may be rotated of the order of 15degrees out of plane, depending on the particle size. The spin rotation can be explained by exchange interaction between neighboring particles with nonparallel (001) planes. The results imply that interparticle interactions can lead to spin directions deviating from the easy axis defined by the magnetic anisotropy.

引用

页数：4

共 34 条

[1] Size dependence of the properties of hematite nanoparticles [J].

Bodker, F ;

Morup, S .

EUROPHYSICS LETTERS, 2000, 52 (02) :217-223

[2] SURFACE EFFECTS IN METALLIC IRON NANOPARTICLES [J].

BODKER, F ;

MORUP, S ;

LINDEROTH, S .

PHYSICAL REVIEW LETTERS, 1994, 72 (02) :282-285

[3] Particle interaction effects in antiferromagnetic NiO nanoparticles [J].

Bodker, F ;

Hansen, MF ;

Koch, CB ;

Morup, S .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2000, 221 (1-2) :32-36

[4] NONCOLLINEAR SPIN ARRANGEMENT IN ULTRAFINE FERRIMAGNETIC CRYSTALLITES [J].

COEY, JMD .

PHYSICAL REVIEW LETTERS, 1971, 27 (17) :1140-+

[5] Dynamics of an interacting particle system: Evidence of critical slowing down [J].

Djurberg, C ;

Svedlindh, P ;

Nordblad, P ;

Hansen, MF ;

Bodker, F ;

Morup, S .

PHYSICAL REVIEW LETTERS, 1997, 79 (25) :5154-5157

[6]

Dormann JL, 1997, ADV CHEM PHYS, V98, P283, DOI 10.1002/9780470141571.ch4

[7] Interparticle interactions in composites of nanoparticles of ferrimagnetic (γ-Fe2O3) and antiferromagnetic (CoO,NiO) materials -: art. no. 134416 [J].

Frandsen, C ;

Ostenfeld, CW ;

Xu, M ;

Jacobsen, CS ;

Keller, L ;

Lefmann, K ;

Morup, S .

PHYSICAL REVIEW B, 2004, 70 (13) :134416-1

[8] Inter-particle interactions in composites of antiferromagnetic nanoparticles [J].

Frandsen, C ;

Morup, S .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2003, 266 (1-2) :36-48

[9]

FRANDSEN C, IN PRESS

[10] Magnetic dynamics of weakly and strongly interacting hematite nanoparticles [J].

Hansen, MF ;

Koch, CB ;

Morup, S .

PHYSICAL REVIEW B, 2000, 62 (02) :1124-1135

← 1 2 3 4 →