ESR study of Co-doped TiO2 thin films

被引：42

作者：

Rameev, BZ

Yildiz, F

Tagirov, LR

Aktas, B

Park, WK

Moodera, JS

机构：

[1] MIT, Francis Bitter Natl Magnet Lab, Cambridge, MA 02139 USA

[2] Kazan VI Lenin State Univ, Kazan 420008, Russia

[3] Gebze Inst Technol, TR-41400 Gebze Koceali, Turkey

[4] Kazan Engn Phys Inst, Kazan 420029, Russia

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2003年 / 258卷

关键词：

spin glasses; granular magnetic film; electron spin resonance;

D O I：

10.1016/S0304-8853(02)01088-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Co:TiO2 thin films prepared by reactive co-sputtering deposition were studied by electron spin resonance (ESR) technique. Magnetization measurements showed hysteretic behavior with the coercive field between 55 and 65 Oe and the saturation magnetization at room temperature ranging from 7 (2.2% Co) to 28 emu/cm(3) (8.5% Co). ESR measurements at X-band (9.5 GHz) revealed an anomaly in the temperature behavior of the absorption intensity near the temperature at 60 K. This behavior is attributed to an unconventional spin-glass-like behavior, which results from competition of long-range dipole-dipole interaction and anisotropy fields in ferromagnetic Co nanoparticles. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

收藏

页码：361 / 364

页数：4

相关论文

共 17 条

[1] Evidence of spin disorder at the surface-core interface of oxygen passivated Fe nanoparticles [J].

Del Bianco, L ;

Hernando, A ;

Multigner, M ;

Prados, C ;

Sanchez-Lopez, JC ;

Fernandez, A ;

Conde, CF ;

Conde, A .

JOURNAL OF APPLIED PHYSICS, 1998, 84 (04) :2189-2192

[2] Zener model description of ferromagnetism in zinc-blende magnetic semiconductors [J].

Dietl, T ;

Ohno, H ;

Matsukura, F ;

Cibert, J ;

Ferrand, D .

SCIENCE, 2000, 287 (5455) :1019-1022

[3] Magnetic and optical properties of ionic ferrofluids based on nickel ferrite nanoparticles [J].

Hasmonay, E ;

Depeyrot, J ;

Sousa, MH ;

Tourinho, FA ;

Bacri, JC ;

Perzynski, R ;

Raikher, YL ;

Rosenman, I .

JOURNAL OF APPLIED PHYSICS, 2000, 88 (11) :6628-6635

[4] Competing interactions in dispersions of superparamagnetic nanoparticles [J].

Held, GA ;

Grinstein, G ;

Doyle, H ;

Sun, SH ;

Murray, CB .

PHYSICAL REVIEW B, 2001, 64 (01)

[5] Magnetic properties and spin disorder in nanocrystalline materials [J].

Hernando, A .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1999, 11 (48) :9455-9482

[6] Robust electrical spin injection into a semiconductor heterostructure [J].

Jonker, BT ;

Park, YD ;

Bennett, BR ;

Cheong, HD ;

Kioseoglou, G ;

Petrou, A .

PHYSICAL REVIEW B, 2000, 62 (12) :8180-8183

[7] Lateral drag of spin coherence in gallium arsenide [J].

Kikkawa, JM ;

Awschalom, DD .

NATURE, 1999, 397 (6715) :139-141

[8] Room-temperature ferromagnetism in transparent transition metal-doped titanium dioxide [J].

Matsumoto, Y ;

Murakami, M ;

Shono, T ;

Hasegawa, T ;

Fukumura, T ;

Kawasaki, M ;

Ahmet, P ;

Chikyow, T ;

Koshihara, S ;

Koinuma, H .

SCIENCE, 2001, 291 (5505) :854-856

[9] ELECTRON SPIN RESONANCE OF CO2+ IONS COMBINED WITH DEFECTS IN RUTILE (TIO2) [J].

MIYAKO, Y .

PHYSICS LETTERS A, 1967, A 24 (12) :635-&

[10] (Ga,Mn)As: A new diluted magnetic semiconductor based on GaAs [J].

Ohno, H ;

Shen, A ;

Matsukura, F ;

Oiwa, A ;

Endo, A ;

Katsumoto, S ;

Iye, Y .

APPLIED PHYSICS LETTERS, 1996, 69 (03) :363-365