Role of Zn-interstitial defect states on d0 ferromagnetism of mechanically milled ZnO nanoparticles

被引：39

作者：

Ghose, Srabantika ^{[1
]}

Rakshit, Tamita ^{[2
]}

Ranganathan, R. ^{[3
]}

Jana, D. ^{[1
]}

机构：

[1] Univ Calcutta, Dept Phys, Kolkata 700009, W Bengal, India

[2] Indian Inst Technol, Dept Phys, Kharagpur 721302, W Bengal, India

[3] Saha Inst Nucl Phys, Condensed Matter Phys Div Expt, Kolkata 700064, W Bengal, India

来源：

RSC ADVANCES | 2015年 / 5卷 / 121期

关键词：

OPTICAL-PROPERTIES; LUMINESCENCE; EMISSION; NANORODS;

D O I：

10.1039/c5ra13846a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Ferromagnetism in the nanostructures of undoped oxide semiconductors has become an exciting problem nowadays for its potential future applications in spintronics. In order to elucidate the room temperature d(0) ferromagnetism of oxide semiconductors, we have investigated the changes in magnetic property of ZnO nanoparticles with the reduction of size by mechanical milling. We have observed that ferromagnetic ordering appears in the sample when the particle size decreases from 39 +/- 1 nm to 30 +/- 1 nm. This observation strongly supports the idea of the effect of specific grain boundaries in nanoparticles. The results of Raman scattering also support this observation. From photoluminescence spectra shifted green emissions have been found for ferromagnetic samples. This indicates clearly two different origins for green emissions that are strongly related to the changes in magnetic property. Observations from electron spin resonance spectra suggest that zinc related interstitial defects are significant to give rise to this ferromagnetic coupling. An impurity level formed by the interstitial defects at the surfaces could satisfy the Stoner criteria for the occurrence of band ferromagnetism for these samples.

引用

页码：99766 / 99774

页数：9

共 52 条

[1] Micro-Raman investigation of optical phonons in ZnO nanocrystals [J].

Alim, KA ;

Fonoberov, VA ;

Shamsa, M ;

Balandin, AA .

JOURNAL OF APPLIED PHYSICS, 2005, 97 (12)

[2] Raman study of E2 and surface phonon in zinc oxide nanoparticles surrounded by organic molecules [J].

Chassaing, P.-M. ;

Demangeot, F. ;

Paillard, V. ;

Zwick, A. ;

Combe, N. ;

Pages, C. ;

Kahn, M. L. ;

Maisonnat, A. ;

Chaudret, B. .

APPLIED PHYSICS LETTERS, 2007, 91 (05)

[3] d0 ferromagnetism [J].

Coey, JMD .

SOLID STATE SCIENCES, 2005, 7 (06) :660-667

[4] Donor impurity band exchange in dilute ferromagnetic oxides [J].

Coey, JMD ;

Venkatesan, M ;

Fitzgerald, CB .

NATURE MATERIALS, 2005, 4 (02) :173-179

[5] Temperature dependence of raman scattering in ZnO [J].

Cusco, Ramon ;

Alarcon-Llado, Esther ;

Ibanez, Jordi ;

Artus, Luis ;

Jimenez, Juan ;

Wang, Buguo ;

Callahan, Michael J. .

PHYSICAL REVIEW B, 2007, 75 (16)

[6] 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

[7] Optical properties of ZnO nanostructures [J].

Djurisic, Aleksandra B. ;

Leung, Yu Hang .

SMALL, 2006, 2 (8-9) :944-961

[8] Defects and the optical absorption in nanocrystalline ZnO [J].

Dutta, Sreetama ;

Chattopadhyay, Sanjay ;

Sutradhar, Manas ;

Sarkar, Anindya ;

Chakrabarti, Mahuya ;

Sanyal, Dirtha ;

Jana, Debnarayan .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2007, 19 (23)

[9] Role of defects in tailoring structural, electrical and optical properties of ZnO [J].

Dutta, Sreetama ;

Chattopadhyay, S. ;

Sarkar, A. ;

Chakrabarti, Mahuya ;

Sanyal, D. ;

Jana, D. .

PROGRESS IN MATERIALS SCIENCE, 2009, 54 (01) :89-136

[10] Zn vacancy induced green luminescence on non-polar surfaces in ZnO nanostructures [J].

Fabbri, F. ;

Villani, M. ;

Catellani, A. ;

Calzolari, A. ;

Cicero, G. ;

Calestani, D. ;

Calestani, G. ;

Zappettini, A. ;

Dierre, B. ;

Sekiguchi, T. ;

Salviati, G. .

SCIENTIFIC REPORTS, 2014, 4

← 1 2 3 4 5 6 →