Magnetic and electronic properties of nanocrystalline Gd3Fe5O12 garnet

Lassri, H.; Hlil, E.K.; Prasad, Shiva; Krishnan, R.

doi:10.1016/j.jssc.2011.09.034

Cited by 19 publications

(15 citation statements)

References 18 publications

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“…M a n u s c r i p t Over the last decade, many methods have been developed for preparing iron garnet nanomaterials. The widely used methods are the solid-state reaction method [5], high energy ball mill [6], sol-gel method [7], co-precipitation [8], mechanochemical method [9]. Among these wet chemical methods, combustion method is an effective route to synthesize homogeneous nanoparticles within a short span of time (20 min).…”

Section: Introductionmentioning

confidence: 99%

Tuning the composition and magnetostructure of dysprosium iron garnets by Co-substitution: An XRD, FT-IR, XPS and VSM study

Ramachandran

Vishista

2015

Applied Surface Science

129

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Section: Introductionmentioning

confidence: 99%

Tuning the composition and magnetostructure of dysprosium iron garnets by Co-substitution: An XRD, FT-IR, XPS and VSM study

Ramachandran

Vishista

2015

Applied Surface Science

129

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“…The band structures are insulating with a wide bandgap of about 0.4 eV. The partial DOS of Fe in the Fe2 site for GdIG (Lassri et al, 2011) is characterized by a triplet of t 2 (Fe 3d) orbitals as the major spin state above E F , which can be related to the three ÁI/2I peaks at the Fe K pre-edge region, as shown schematically in Fig. 3(a).…”

Section: Energy Dependence Of the Observed Asymmetric Ratiomentioning

confidence: 99%

“…The orientation matrix, according to the definition of Busing & Levy (1967), is 0:0253894; 0:0601544; À0:0461049 0:0385591; À0:0522561; À0:0465942 À0:0655703; À0:0075392; À0:0459151 0 @ 1 A : theory (FP-DFT), applying the local spin-density approximation (LSDA) for yttrium iron garnet (YIG, Y 3 Fe 5 O 12 ) (Baettig & Oguchi, 2008) and for GdIG (Lassri et al, 2011). The total density of state (DOS) was reported to have insulating characteristics with a bandgap at the Fermi energy E F .…”

Section: Energy Dependence Of the Observed Asymmetric Ratiomentioning

confidence: 99%

“…The total density of state (DOS) was reported to have insulating characteristics with a bandgap at the Fermi energy E F . In the calculation of the collinear magnetic state of GdIG, Lassri et al (2011) use the full potential linear augmented plane waves (FLAPW) method combined with the general gradient approximation (GGA) in the Kohn-Sham equation. Based on calculations for GdIG (Lassri et al, 2011) and YIG (Baettig & Oguchi, 2008), the partial DOS of Fe ions in the Fe1 and Fe2 sites is schematically depicted within the region from À1 to 3 eV, around E F (see Fig.…”

Section: Energy Dependence Of the Observed Asymmetric Ratiomentioning

confidence: 99%

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Resonant and non-resonant magnetic scatterings with circularly polarized X-rays: magnetic scattering factor and electron density of gadolinium iron garnet

2017

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Theoretical and experimental studies on resonant magnetic scattering have been carried out using circularly polarized X-rays. Polarization dependence of the asymmetric ratio between right- and left-handed polarized scattering amplitudes has revealed that resonant and non-resonant magnetic scatterings can be observed simultaneously. In this study, synchrotron X-ray intensity experiments were conducted on Gd iron garnet (GdIG) at the pre-edge of the Fe K absorption edge. The asymmetric ratio between circular polarizations exhibited three peaks due to the resonant magnetic responses of Fe in the Fe2 (24d) site. These magnetic responses are antiparallel and have apparently higher resolution than dispersive X-ray magnetic circular dichroism at the pre-edge region; this can be mainly attributed to electric dipole transitions from 1s to t energy levels of the 3d orbitals in the tetrahedral symmetry in an unstable state quenched at higher temperature. Resonant magnetic scattering factors f' were estimated from the asymmetric ratios. Fourier analysis was conducted using the intensity differences among circularly polarized X-rays at an energy of E = 7.1085 keV. At this energy level, the characteristic distribution of magnetic electron density was clearly observed. This distribution was interpreted as a spin arrangement of Gd and Fe ions in GdIG. Also observed was the presence of hybridization of the magnetic electron orbitals as well as of the resonant magnetic Fe. The proposed method has the potential to be widely used in crystal structure analysis.

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“…We had used this model to obtained various fundamental parameters such as the local anisotropy, and the correlation lengths [22][23][24] in several amorphous and nanomaterial alloys. The nanograins present a lower symmetry in the regions particularly near the surface due to their low dimension, consequently a kind of uniaxial anisotropy is obtained.…”

Section: Random Magnetic Anisotropy Constantmentioning

confidence: 99%

Comparative Study of Nanoparticles Fe 100−x Co x Alloy Synthesized by High Energy Ball Milling and by Polyol Process

Zehani

Boutahar

Elamiri

et al. 2015

J Supercond Nov Magn

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We report the synthesis of the Fe 100−x Co x (x = 55, 50, 45) alloys by two ways consisting in high energy ball milling and polyol process. A structural and morphological study of all samples has been undertaken by X-ray diffraction (XRD) using the Rietveld method, by scanning electron microscopy (SEM), and by transmission electron microscopy (MET). The size and crystallinity of the particles was found to depend on the synthesis method. The magnetic properties and the DOS calculation have been also investigated. It has been found that both were remarkably dependent on the Co/Fe molar ratio. It has been observed that the best magnetic properties was obtained for the sample x = 45 prepared by the polyol process where M s = 235 emu/g and H c = 93 Oe. We have shown also that the random local anisotropy field H r and the local anisotropy K L decrease with increasing Co content.

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Magnetic and electronic properties of nanocrystalline Gd3Fe5O12 garnet

Cited by 19 publications

References 18 publications

Tuning the composition and magnetostructure of dysprosium iron garnets by Co-substitution: An XRD, FT-IR, XPS and VSM study

Tuning the composition and magnetostructure of dysprosium iron garnets by Co-substitution: An XRD, FT-IR, XPS and VSM study

Resonant and non-resonant magnetic scatterings with circularly polarized X-rays: magnetic scattering factor and electron density of gadolinium iron garnet

Comparative Study of Nanoparticles Fe 100−x Co x Alloy Synthesized by High Energy Ball Milling and by Polyol Process

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