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Dwivedi, G. D.; Tseng, K. F.; Chan, C. L.; Shahi, Prashant; Lourembam, James; Chatterjee, B.; Ghosh, Anup K.; Yang, H. D.; Chatterjee, Sandip

doi:10.1103/physrevb.82.134428

Cited by 72 publications

(25 citation statements)

References 30 publications

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“…The variable-rangehopping (VRH) conduction of polarons has been found to dominate in this temperature region. The conduction mechanism due to the variable range hopping of polaron at low temperature can be described by the Mott's equation [38][39][40] 41 are that the value of αR > 1 and that E h > k B T. Both of these conditions are satisfied in all the studied samples (see Table 2). It is not possible that the variation of particle sizes can change the N(E F ), which in effect can account for the large decrease of T 0 .…”

Section: Magnetic Propertiesmentioning

confidence: 76%

Structural, transport and optical properties of (La_0.6Pr_0.4)_0.65Ca_0.35MnO₃nanocrystals: a wide band-gap magnetic semiconductor

et al. 2015

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Section: Magnetic Propertiesmentioning

confidence: 76%

Structural, transport and optical properties of (La_0.6Pr_0.4)_0.65Ca_0.35MnO₃nanocrystals: a wide band-gap magnetic semiconductor

et al. 2015

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“…It monotonically increases with increase of x , indicating the continuous formation of solid solutions. This is due to the fact that both end compounds (CoCr 2 O 4 and CoFe 2 O 4 ) have cubic spinel structure in Fd‐3m / Fd3m space groups 21, 22. The interesting thing is that, as shown in Fig.…”

Section: Resultsmentioning

confidence: 97%

Compensation effect and magnetostriction in CoCr_2−xFe_xO₄

Zhang¹,

Wang²,

Liu³

et al. 2012

Physica Status Solidi (b)

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The magnetic compensation and magnetostriction properties in Fe-doped CoCr 2 O 4 samples have been investigated. Structural and magnetic measurements imply that the doped Fe 3þ ions initially occupy the B1 (Cr) sites when x < 0.1, and then mainly take the A (Co) sites. This behaviour results in a role conversion of magnetic contributors and a composition compensation between two competitively magnetic sublattices at x ¼ 0.1. Temperature-dependent compensation has also been found in the samples with x ¼ 0.1-0.22, with the compensation temperature in the range of 40 -104 K. The Fe 3þ doping also modulates the exchange interaction of the system and prevents the formation of long-range conical order of spins. The magnetoelectric transition temperature at 23 K in CoCr 2 O 4 is shifted to lower temperature by increasing the dopants. The magnetostriction effect in this system has been observed for the first time. The strain has a maximum value of about 280 ppm at x ¼ 0.4. The magnetostriction is consistent with the behaviour of the two magnetic compensations.

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“…There has been only a very little work reported in the literature on the properties of non-magnetic Mo incorporated CFO. [32][33][34] Furthermore, while there exists very few efforts, fundamental understanding of the structure-composition-property relation in Mo-incorporated CFO is missing at this time. Additionally, although still some unanswered, fundamental scientific questions exists, recently observed and/or predicted ferroelectric/multiferroic character of Mo incorporated CFO is promising for future applications in magneto-electronics.…”

Section: Introductionmentioning

confidence: 99%

Effect of Molybdenum Incorporation on the Structure and Magnetic Properties of Cobalt Ferrite

et al. 2017

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Melendez, A.; Manadhar, S.; Singamaneni, S. R.; Reddy, Kongara M.; Gandha, Kinjal H.; Niebedim, I. C.; and Ramana, C. V., "Effect of Molybdenum Incorporation on the Structure and Magnetic Properties of Cobalt Ferrite" (2017). Ames Laboratory Accepted Manuscripts. 61. AbstractWe report on the effect of molybdenum (Mo) incorporation on the crystal structure, surface morphology, Mo chemical valence state, and magnetic properties of cobalt ferrite (CoFe2O4, referred to CFO). Molybdenum incorporated cobalt ferrite (CoFe2-xMoxO4, referred to CFMO) ceramics were prepared by the conventional solid-state reaction method by varying the Mo concentration in the range of x = 0.0-0.3. X-ray diffraction studies indicate that the CFMO materials crystallize in inverse spinel cubic phase. Molybdenum incorporation induced lattice parameter increase from 8.322 to 8.343 Å coupled with a significant increase in density from 5.4 to 5.7 g/cm3 was evident in structural analyses. Scanning electron microscopy imaging analyses indicate that the Mo incorporation induces agglomeration of particles leading to larger particle size with increasing x(Mo) values. Detailed X-ray photoelectron spectroscopic (XPS) analyses indicate the increasing Mo content with increasing x from 0.0 to 0.3. XPS confirms that the chemistry of Mo is complex in these CFMO compounds; Mo ions exist in the lower oxidation state (Mo4+) for higher x while in a mixed chemical valence state (Mo4+, Mo5+, Mo6+) for lower x values. From the temperature-dependent magnetization, the samples show ferrimagnetic behavior including the pristine CFO. From the isothermal magnetization measurements, we find almost 2-fold decrease in coercive field (Hc) from 2143 to 1145 Oe with the increase in Mo doping up to 30%. This doping-dependent Hc is consistently observed at all the temperatures measured (4, 100, 200, and 300 K). Furthermore, the saturation magnetization estimated at 4 K and at 1.5 T (from M-H loops) goes through a peak at 92 emu/g (at 15% Mo doping) from 81 emu/g (pristine CFO), and starts decreasing to 79 emu/g (at 30% Mo doping). The results demonstrate that the crystal structure, microstructure, and magnetic properties can be tuned by controlling the Mo-content in the CFMO materials. ABSTRACTWe report on the effect of molybdenum (Mo) incorporation on the crystal structure, surface morphology, Mo chemical valence state and magnetic properties of cobalt ferrite (CoFe2O4, referred to CFO). Molybdenum incorporated cobalt ferrite (CoFe2-xMoxO4, referred to CFMO) ceramics were prepared by the conventional solid-state reaction method by varying the Mo concentration in the range of x=0.0-0.3. X-ray diffraction studies indicate that the CFMO materials crystallize in inverse spinel cubic phase. Molybdenum incorporation induced lattice parameter increase from 8.322 to 8.343 Å coupled with a significant increase in density from 5.4 to 5.7 g/cm 3 was evident in structural analyses. Scanning electron microscopy imaging analysis indicate that the Mo incorporation induces agglomeration of pa...

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Signature of ferroelectricity in magnetically ordered Mo-dopedCoFe2O4

Cited by 72 publications

References 30 publications

Structural, transport and optical properties of (La_0.6Pr_0.4)_0.65Ca_0.35MnO₃nanocrystals: a wide band-gap magnetic semiconductor

Structural, transport and optical properties of (La_0.6Pr_0.4)_0.65Ca_0.35MnO₃nanocrystals: a wide band-gap magnetic semiconductor

Compensation effect and magnetostriction in CoCr_2−xFe_xO₄

Effect of Molybdenum Incorporation on the Structure and Magnetic Properties of Cobalt Ferrite

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Signature of ferroelectricity in magnetically ordered Mo-dopedCoFe2O4

Cited by 72 publications

References 30 publications

Structural, transport and optical properties of (La0.6Pr0.4)0.65Ca0.35MnO3nanocrystals: a wide band-gap magnetic semiconductor

Structural, transport and optical properties of (La0.6Pr0.4)0.65Ca0.35MnO3nanocrystals: a wide band-gap magnetic semiconductor

Compensation effect and magnetostriction in CoCr2−xFexO4

Effect of Molybdenum Incorporation on the Structure and Magnetic Properties of Cobalt Ferrite

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Structural, transport and optical properties of (La_0.6Pr_0.4)_0.65Ca_0.35MnO₃nanocrystals: a wide band-gap magnetic semiconductor

Structural, transport and optical properties of (La_0.6Pr_0.4)_0.65Ca_0.35MnO₃nanocrystals: a wide band-gap magnetic semiconductor

Compensation effect and magnetostriction in CoCr_2−xFe_xO₄