兰州大学机构库 >物理科学与技术学院
Microstructure, magnetic properties and TMR effect of Fe-SiO2 granular films investigated by Mossbauer spectroscopy
Ge, SH(葛世慧); Xi, L(席力); Zhang, ZZ; Liu, YP; Li, CX; Ge, SH (reprint author), Lanzhou Univ, Dept Phys, Minist Educ, Appl Magnet Key Lab, Lanzhou 730000, Peoples R China.
Indexed BySCIE ; CPCI-S ; EI
2001-05-01
Conference NameInternational Conference on Magnetism
Conference DateAUG 06-11, 2000
Conference PlaceRECIFE, BRAZIL
AbstractFe-SiO2 granular films with various metal volume fractions (f(v)) were fabricated by RF co-sputtering. The microstructure and magnetic properties as well as the tunneling magneto resistance (TMR) were systematically investigated. The TMR exists in the samples with f(v) < 0.5, and the Fe-0.33(SiO2)(0.67) film exhibits the largest TMR value of -3.3% at room temperature under 1.3 T magnetic field. The transmission electron microscopy images indicate that these samples consist of small Fe particles with the size range from 1.0 to 15.0 mn. separated by insulating SiO2 matrix and exhibit TMR effect. Mossbauer measurement reveals that more superparamagnetic Fe component and less paramagnetic Fe2SiO4 are in favor of the higher probability of spin-dependent tunneling, thus larger TMR value. For the samples with f(v)0.43, Mossbauer study shows the existence of perpendicular magnetic anisotropy, and the strongest perpendicular magnetic anisotropy was observed in the sample of Fe-0.47(SiO2)(0.53). This phenomenon may be ascribed to the stress anisotropy in this film. (C) 2001 Elsevier Science B.V. All rights reserved.
KeywordTunneling Magnetoresistance Granular Systems Mossbauer Spectroscopy
Publication PlaceAMSTERDAM
Subject AreaMaterials Science ; Physics
Source PublicationJOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Pages1533-1535
DOI10.1016/S0304-8853(00)00948-3
PublisherELSEVIER
Language英语
ISSN0304-8853
First Inst
WOS IDWOS:000170628400167
EI ID20104413348377
DepartmentLanzhou Univ, Dept Phys, Minist Educ, Appl Magnet Key Lab, Lanzhou 730000, Peoples R China
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type会议论文
Identifierhttp://ir.lzu.edu.cn/handle/262010/113320
Collection物理科学与技术学院
Corresponding AuthorGe, SH (reprint author), Lanzhou Univ, Dept Phys, Minist Educ, Appl Magnet Key Lab, Lanzhou 730000, Peoples R China.
Recommended Citation
GB/T 7714
Ge, SH,Xi, L,Zhang, ZZ,et al. Microstructure, magnetic properties and TMR effect of Fe-SiO2 granular films investigated by Mossbauer spectroscopy[C]. AMSTERDAM,2001:1533-1535.
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