Change in the magnetostructural properties of rare earth doped cobalt ferrites relative to the magnetic anisotropy

Naik, S.R.; Salker, A. V.

doi:10.1039/c2jm15228b

Cited by 217 publications

(117 citation statements)

References 33 publications

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“…On increasing the concentration of Y 3+ , the hyperfine field strength and isomer shift first increases and then decreases, whereas the quadrupole splitting continuously increases. Magnetization and blocking temperature decrease with substitution of Dy and Gd ions to CoFe 2 O 4 [9]. Three percent doping of Ce, Sm, Er, Gd, Dy and La into CoFe 2 O 4 decreases the specific magnetization, however, Ho and Yb doping increases this parameter [10].…”

Section: Introductionmentioning

confidence: 94%

Structural and magnetic study of dysprosium substituted cobalt ferrite nanoparticles

Kumar

Srivastava

Singh

et al. 2016

Journal of Magnetism and Magnetic Materials

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Section: Introductionmentioning

confidence: 94%

Structural and magnetic study of dysprosium substituted cobalt ferrite nanoparticles

Kumar

Srivastava

Singh

et al. 2016

Journal of Magnetism and Magnetic Materials

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“…This enhancement in the magnetic properties is attributed to the higher magnetic moment of Gd 3+ (4f 7 orbital) which is residing in octahedral sites is higher when compared to that of Fe 3+ (3d 5 )[36,44]. This can also be ascribed due to the migration of Co 2+ (3d 7 ) ions from the octahedral to the tetrahedral sites with a magnetic moment aligned anti-parallel to those of rare earth (RE 3+ ) ions in the spinel lattice and this increase magnetic properties is also theoretically expected[36,44]. Decrease in magnetization once Gd 3+ content is beyond x=0.1in CFGO might be attributed to compositional saturation in the CFO lattice.…”

mentioning

confidence: 92%

Chemical bonding and magnetic properties of gadolinium (Gd) substituted cobalt ferrite

Puli

Adireddy

Ramana

2015

Journal of Alloys and Compounds

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Polycrystalline gadolinium (Gd) substituted cobalt ferrites (CoFe 2-x Gd x O 4 ; x=0-0.3, referred to CFGO) ceramics have been synthesized by solid state reaction method. Chemical bonding, crystal structure and magnetic properties of CFGO compounds have been evaluated as a function of Gd-content. X-ray diffraction and Raman spectroscopic analyses confirmed the formation of inverse spinel structure. However, a secondary ortho-ferrite phase (GdFeO 3 ) nucleates for higher values of Gd-content. A considerable increase in the saturation magnetization has been observed upon the initial substitution of Gd (x=0.1). The saturation magnetization drastically decreases at higher Gd content (x≥0.3). No contribution from ortho-ferrite GdFeO 3 phase is noted to the magnetic properties. The increase in the magnetic saturation magnetization is attributed to the higher magnetic moment of Gd 3+ (4f 7 ) residing in octahedral sites is higher when compared to that of Fe 3+ (3d 5 ) and as well due to the migration of Co 2+ (3d 7 ) ions from the octahedral to the tetrahedral sites with a magnetic moment aligned anti-parallel to those of rare earth (RE 3+ ) ions in the spinel lattice. Increase in coercivity with increase in Gd 3+ is content is attributed to magnetic anisotropy in the ceramics.

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“…Based on the comparison of the M s value with the previously reported results, all the assynthesized ferrite nanocrystals exhibit excellent magnetic properties with higher saturation magnetization. [17][18][19][20][21] Whereas, due to their small particle size and surface effects, the M s values for MFe 2 O 4 nanoparticles, as compared to those of their corresponding bulk counterparts, are lower. To confirm the superparamagnetic properties of NiFe 2 O 4 and MnFe 2 O 4 nanoparticles, ZFC and FC curves of three representative samples measured in an applied magnetic field of 100 Oe are given in Fig.…”

mentioning

confidence: 99%

Microstructure and magnetic properties of MFe2O4 (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method

Wang

Ding

Zhao

et al. 2015

Journal of Applied Physics

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Three kinds of spinel ferrite nanocrystals, MFe2O4 (M = Co, Ni, and Mn), are synthesized using colloid mill and hydrothermal method. During the synthesis process, a rapid mixing and reduction of cations with sodium borohydride (NaBH4) take place in a colloid mill then through a hydrothermal reaction, a slow oxidation and structural transformation of the spinel ferrite nanocrystals occur. The phase purity and crystal lattice parameters are estimated by X-ray diffraction studies. Scanning electron microscopy and transmission electron microscopy images show the morphology and particle size of the as-synthesized ferrite nanocrystals. Raman spectrum reveals active phonon modes at room temperature, and a shifting of the modes implies cation redistribution in the tetrahedral and octahedral sites. Magnetic measurements show that all the obtained samples exhibit higher saturation magnetization (Ms). Meanwhile, experiments demonstrate that the hydrothermal reaction time has significant effects on microstructure, morphologies, and magnetic properties of the as-synthesized ferrite nanocrystals.

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Change in the magnetostructural properties of rare earth doped cobalt ferrites relative to the magnetic anisotropy

Cited by 217 publications

References 33 publications

Structural and magnetic study of dysprosium substituted cobalt ferrite nanoparticles

Structural and magnetic study of dysprosium substituted cobalt ferrite nanoparticles

Chemical bonding and magnetic properties of gadolinium (Gd) substituted cobalt ferrite

Microstructure and magnetic properties of MFe2O4 (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method

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