Electric Field Effect in Diluted Magnetic Insulator Anatase<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Co</mml:mi><mml:mtext mathvariant="normal">:</mml:mtext><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:msub><mml:mi>TiO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Zhao, Tong; Shinde, S. R.; Ogale, S. B.; Zheng, Haimei; Venkatesan, T.; Ramesh, R.; Sarma, S. Das

doi:10.1103/physrevlett.94.126601

Cited by 101 publications

(61 citation statements)

References 35 publications

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“…Taking into consideration the highly insulating nature of ZnO, it seems to argue against the explanation of enhancement in magnetic ordering as a result of increased carrier concentration as shown by studies on bulk samples [39]. According to the widely used carrier-induced ferromagnetic mechanism [22,40], a large amount of free carriers and mobility are two important factors to get room temperature ferromagnetism. As recent studies reported, a ferromagnetic exchange mechanism which involves a spin-polarized electron trapped at an oxygen vacancy [41].…”

Section: Resultsmentioning

confidence: 92%

Defect-induced room temperature ferromagnetism in Fe and Na co-doped ZnO nanoparticles

Jiang

Yan

2012

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 92%

Defect-induced room temperature ferromagnetism in Fe and Na co-doped ZnO nanoparticles

Jiang

Yan

2012

Journal of Alloys and Compounds

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“…Just because of the demand of practical spintronic applications, ferromagnetic DMSs with curie temperatures (T c ) greatly exceeding room temperature are required. In many reports, doping DMSs with transition metals (TM) showed an effective route to obtain room-temperature ferromagnetism, such as ZnO [3][4][5], TiO 2 [6][7][8], GaN [9,10] etc.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and room-temperature ferromagnetic properties of single-crystalline Co-doped SnO2 nanocrystals via a high magnetic field

Tang

et al. 2009

Journal of Alloys and Compounds

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“…14,15 The change of magnetization upon the application of an electric field was measured using a vibrating sample magnetometer in the direction of the biasing magnetic field. The MEC was electroded 16 as described before so that an electric field could be applied while the magnetization was determined.…”

mentioning

confidence: 99%

Magnetoelectric nano-Fe3O4∕CoFe2O4∥PbZr0.53Ti0.47O3 composite

Ren

Wuttig

2008

Applied Physics Letters

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A new magnetoelectric hybrid device composed of a nanoparticulate magnetostrictive iron oxide-cobalt ferrite film on a piezoelectric lead zirconic titanate crystal serving as both substrate and straining medium is described. Nano-Fe 3 O 4 / CoFe 2 O 4 particles, ranging from 5 to 42 nm, were prepared using a variation of the sol-gel method. A small electric field, 5 -10 kV cm −1 , applied at the coercive field of the nano-Fe 3 O 4 / CoFe 2 O 4 component modulates the film magnetization up to 10% of the saturation magnetization of ferrite. At the smallest particle size of 5 nm, the coercive field is as low as 25 Oe and the inverse ME E voltage coefficient is as high as ͑10.1 V / cm Oe͒ −1 . © 2008 American Institute of Physics. ͓DOI: 10.1063/1.2841064͔The recent surge of papers describing magnetoelectric composites ͑MECs͒ may be divided into two groups; the first consisting of papers reporting on metal-oxide composites and the second containing those publications dealing with oxide-oxide structures. High MEC susceptibilities at low magnetic fields are achieved with metal-oxide MECs by choosing either glassy metals or designing highly magnetostrictive metallic components with zero demagnetization factor. 1,2 Similar approaches are not as readily accessible for oxide/oxide ME composites as these are predominantly fabricated by thin film technologies, e.g., 3 and the oxide featuring the highest magnetostriction, CoFe 2 O 4 ͑CFO͒, possesses a large magnetocrystalline anisotropy. The fully epitaxial self-assembled 3-1 CFO/BaTiO 3 ME composites 4 represent somewhat of an exception. Therefore, in an effort to reduce the effective magnetocrystalline anisotropy and thereby the coercive force of CFO, we developed a nanoFe 3 O 4 / CoFe 2 O 4 ʈ lead zirconic titanate ͑PZT͒ MEC, whose fabrication and properties are described in the following.To achieve a highly effective magnetoelectric signal, ME composites require high piezoelectric and magnetic susceptibilities. 5,6 Pb͑Zr 0.53 Ti 0.47 ͒O 3 is a well-understood piezoelectric material fulfilling this requirement. Ferromagnetic bulk Co ferrite is a good choice due to its high magnetostriction. However, because of its high magnetocrystalline anisotropy, 7 it has a low magnetostrictive initial susceptibility that results in a low magnetoelectric susceptibility d / dH. In nanoparticles, the effective magnetocrystalline anisotropy is lowered and d / dH can be increased while maintaining its high saturation 8 as has also been demonstrated for Co ferrite. 9 Therefore, in order to create an all-oxide MEC with a large ME coupling coefficient, a nanoFe 3 O 4 / CoFe 2 O 4 / Pb͑Zr 0.53 Ti 0.47 ͒O 3 was developed. This composite yields giant ME voltages under significantly lower magnetic bias fields than previously reported for CFO/PZT MECs. 10 Its manufacture and properties will be described next.The composite was manufactured by spinning a CFO sol-gel 11 onto a mirror polished PZT single crystal substrate, obtained from Fuji Ceramics, Inc. The deposition technique and substrate were ch...

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Electric Field Effect in Diluted Magnetic Insulator AnataseCo: TiO2

Cited by 101 publications

References 35 publications

Defect-induced room temperature ferromagnetism in Fe and Na co-doped ZnO nanoparticles

Defect-induced room temperature ferromagnetism in Fe and Na co-doped ZnO nanoparticles

Synthesis and room-temperature ferromagnetic properties of single-crystalline Co-doped SnO2 nanocrystals via a high magnetic field

Magnetoelectric nano-Fe3O4∕CoFe2O4∥PbZr0.53Ti0.47O3 composite

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