FMR and TEM Studies of Co and Ni Nanoparticles Implanted in the SiO2 Matrix

Édelman, I. S.; Petrakovskaja, Eleonora; Petrov, D. A.; Жарков, С. М.; Хайбуллин, Р. И.; Нуждин, В. И.; Степанов, А. Л.

doi:10.1007/s00723-011-0218-4

Cited by 12 publications

(6 citation statements)

References 44 publications

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“…The resonance field of the anisotropic component generally is plotted against the angle θ, the dependences with θ use to be fitted, in good agreement, with sin 2 θ or cos 2 θ functions [24][25][26][27][28][29][30][31][32]. Its well established the axial symmetry nature for this kind of functions, as magnetization processes perform the higher energy absorption (energy improved by the resonance field) when the magnetizing field is perpendicular to the axial orientation, the resonance field also increases and finds a maximum at this position.…”

Section: Angular Dependencementioning

confidence: 81%

“…Both components exhibit also a broadening as the concentration increases. This important dependence of the signal linewidth with concentration is due to an increase of particle dipolar interactions at mean distances and a consequence of aggregation [28][29][30]. Particle interactions always play an important role on the magnetic resonance absorption phenomena.…”

Section: Particle Concentration Dependencementioning

confidence: 99%

See 1 more Smart Citation

Microwave Absorption in Nanostructured Spinel Ferrites

Vázquez‐Victorio¹,

Acevedo-Salas²,

Valenzuela³

2013

Ferromagnetic Resonance - Theory and Applications

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Section: Angular Dependencementioning

confidence: 81%

Section: Particle Concentration Dependencementioning

confidence: 99%

Microwave Absorption in Nanostructured Spinel Ferrites

Vázquez‐Victorio¹,

Acevedo-Salas²,

Valenzuela³

2013

Ferromagnetic Resonance - Theory and Applications

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“…FMR is in general a suitable method for the evaluation of the magnetic properties of nanogranular media and thin-film systems as it allows the identification of the magnetization value, magnetic anisotropy constants and demagnetization field of a given sample. 304 Hochepied and Pileni published a study on the study of the FMR behaviour of nonstoichiometric zinc ferrite NPs doped with Co 2+ ions or undoped. FMR measurements on texturated samples ( particles subjected to a magnetic field during sample preparation) provided reliable information on the relative thermal variation of the anisotropy constant, and therefore the latter parameter could be evaluated approximately for 3.7 nm zinc ferrite NPs.…”

Section: Characterization Methods For Magnetic Nanostructuresmentioning

confidence: 99%

Characterization techniques for nanoparticles: comparison and complementarity upon studying nanoparticle properties

2018

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Nanostructures have attracted huge interest as a rapidly growing class of materials for many applications. Several techniques have been used to characterize the size, crystal structure, elemental composition and a variety of other physical properties of nanoparticles. In several cases, there are physical properties that can be evaluated by more than one technique. Different strengths and limitations of each technique complicate the choice of the most suitable method, while often a combinatorial characterization approach is needed. In addition, given that the significance of nanoparticles in basic research and applications is constantly increasing, it is necessary that researchers from separate fields overcome the challenges in the reproducible and reliable characterization of nanomaterials, after their synthesis and further process (e.g. annealing) stages. The principal objective of this review is to summarize the present knowledge on the use, advances, advantages and weaknesses of a large number of experimental techniques that are available for the characterization of nanoparticles. Different characterization techniques are classified according to the concept/group of the technique used, the information they can provide, or the materials that they are destined for. We describe the main characteristics of the techniques and their operation principles and we give various examples of their use, presenting them in a comparative mode, when possible, in relation to the property studied in each case.

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“…While the annealing at higher temperatures (1073 K) results in a much larger crystallite for Ni NCs, note that the peaks of Ni(111), Ni (200) and Ni(220) (Figure 3(a)) appear simultaneously. It indicates that Ni NCs are not crystallographically oriented inside the TiO 2 matrix [24]. Upon thermal treatment, Ni NCs in TiO 2 are much more stable than Fe in TiO 2 [23].…”

Section: Structural Propertiesmentioning

confidence: 97%

Investigation of structural and magnetic properties of Ni implanted rutile

Ding

2012

Sci. China Phys. Mech. Astron.

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In this paper, the structural and magnetic properties of Ni metal implanted TiO 2 single crystals are discussed. Ni nanocrystals (NCs) have been formed in TiO 2 after ion implantation. Their crystalline sizes were increased with increasing post-annealing temperature. Metallic Ni NCs inside the TiO 2 matrix are stable up to an annealing temperature of 1073 K. The Ni NCs forming inside TiO 2 are the major contribution of the measured ferromagnetism. diluted magnetic oxides, ion implantation, TiO 2 PACS number(s): 78.67. Bf, 61.05.Cp, 82.80.Yc Citation: Ding B F. Investigation of structural and magnetic properties of Ni implanted rutile.Currently, there is a great deal of interest in diluted magnetic oxides (DMO), because the ferromagnetism is robust well above room temperature. These kinds of materials are fabricated by doping oxide semiconductors, such as ZnO, TiO 2 , SnO 2 , and In 2 O 3 , with transition metals. Many groups have reported the observation of ferromagnetism in transition-metal-doped rutile and anatase TiO 2 [1-4]. However, the origin for the measured ferromagnetism is questionable. It was also found that the measured ferromagnetic properties can originate from nanoscale precipitates [5-10], or defects inside TiO 2 [11-13]. Akdogan et al. [14] identified two ferromagnetic contributions in Co implanted TiO 2 from diluted Co 2+ and metallic Co nanocrystals (NCs), respectively. Recently several review articles have addressed the complexity of transition-metal-doped oxides concerning the origin of ferromagnetism [15-17]. At the same time, there are some reports about Fe-doped, TiO 2 , Co-doped, TiO 2 , La or Sr-doped, TiO 2 [ 7,18,19]. In those papers, the authors observed the ferromagnetic NCs and pronounced magnetoelectric effects. To optimize these magnetoelectric effects, a systematic investigation of structure, magnetic properties and temperature stability of these NCs is needed. In this article, a correlation between structure and magnetism in Ni-implanted TiO 2 is presented. We try to answer two questions: (i) What is the origin of the ferromagnetism in Ni-implanted TiO 2 , and (ii) what is the effect of postannealing on the magnetic and structural properties of Ni-implanted TiO 2 ? ExperimentsCommercial TiO 2 bulk crystals were implanted with Ni ions at 623 K with a fluence of 4×10 16 cm 2 . The implantation energy was 180 keV, which resulted in a projected range of R P =(84±29) nm and a maximum atomic concentration of about 5% (TRIM code). Annealing was performed in a high-vacuum (base pressure 10 6 mbar) furnace at temperatures ranging from 823 to 1073 K for 15 min. Four samples were investigated and are listed in Table 1. The lattice damage recovered after annealing was evaluated by Rutherford backscattering/channeling spectrometry (RBS/C).

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FMR and TEM Studies of Co and Ni Nanoparticles Implanted in the SiO2 Matrix

Cited by 12 publications

References 44 publications

Microwave Absorption in Nanostructured Spinel Ferrites

Microwave Absorption in Nanostructured Spinel Ferrites

Characterization techniques for nanoparticles: comparison and complementarity upon studying nanoparticle properties

Investigation of structural and magnetic properties of Ni implanted rutile

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