Zero field cooled exchange bias effect in nano-crystalline Mg-ferrite thin film

Dakua, Himadri Roy

doi:10.1063/1.5133798

Cited by 15 publications

(4 citation statements)

References 55 publications

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“…(7) This model has been widely used to estimate the spinglass nature of the two phases. The A f (4468 Oe in H C and 3860 Oe in H EB ) and P f (0.37 in H C and 0.35 in H EB ) parameters are related to frozen spins and A i (264 Oe in H C and 294 Oe in H EB ) and P i (3.52 in H C and 2.91 in H EB ) parameters are related to spin rotation [65,[96][97][98]. Parameters represented by A with dimensions of the magnetic field determine the weight of the relation while P the dimensionless parameters are related to the relaxation rate.…”

Section: Resultsmentioning

confidence: 99%

Emergent magnetism and exchange bias effect in iron oxide nanocubes with tunable phase and size

Attanayake¹,

Chanda²,

Das³

et al. 2022

J. Phys.: Condens. Matter

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We report a systematic investigation of the magnetic properties including the exchange bias (EB) effect in an iron oxide nanocube system with tunable phase and average size (10, 15, 24, 34, and 43 nm). X-ray diffraction and Raman spectroscopy reveal the presence of Fe3O4, FeO, and α-Fe2O3 phases in the nanocubes, in which the volume fraction of each phase varies depending upon particle size. While the Fe3O4 phase is dominant in all and tends to grow with increasing particle size, the FeO phase appears to coexist with the Fe3O4 phase in 10, 15, and 24 nm nanocubes but disappears in 34 and 43 nm nanocubes. The nanocubes exposed to air resulted in an α-Fe2O3 oxidized surface layer whose thickness scaled with particle size resulting in a shell made of α-Fe2O3 phase and a core containing Fe3O4 or a mixture of both Fe3O4 and FeO phases. Magnetometry indicates that the nanocubes undergo Morin (of the α-Fe2O3 phase) and Verwey (of the Fe3O4 phase) transitions at ~250 K and ~120 K, respectively. For smaller nanocubes (10, 15, and 24 nm), the exchange bias (EB) effect is observed below 200 K, of which the 15 nm nanocubes showed the most prominent EB with optimal antiferromagnetic (AFM) FeO phase. No EB is reported for larger nanocubes (34 and 43 nm). The observed EB effect is ascribed to the strong interfacial coupling between the ferrimagnetic (FiM) Fe3O4 phase and AFM FeO phase, while its absence is related to the disappearance of the FeO phase. The Fe3O4/ α-Fe2O3 (FiM/AFM) interfaces are found to have negligible influence on the EB. Our findings shed light on the complexity of the EB effect in mixed-phase iron oxide nanosystems and pave the way to design exchange-coupled nanomaterials with desirable magnetic properties for biomedical and spintronic applications.

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Section: Resultsmentioning

confidence: 99%

Emergent magnetism and exchange bias effect in iron oxide nanocubes with tunable phase and size

Attanayake¹,

Chanda²,

Das³

et al. 2022

J. Phys.: Condens. Matter

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“…While cooling the sample down to 5 K, the magnetic field is switched-off. Therefore, shifting of M(H) loop represents here ZFC exchange bias [E-B] effect [40]. ZFC E-B effect was reported earlier by Nayak et al in bulk Mn 2 PtGa alloys [41].…”

Section: Study Of Magnetic Property Formentioning

confidence: 86%

“…Ferromagnetism of Cu 2 − x Mn x V 2 O 7 (x = 0.05, 0.1, and 0.15) samples is originated from spin canting due to D-M interaction [7,10]. It is possible that Mn 2+ spins are polarizing the nearest Cu 2+ spins quite strongly and therefore inside the host structure there is an in-homogeneous distributions of strongly coupled weakly coupled Mn 2+ -Cu 2+ spins giving rise to unidirectional anisotropy in the initial magnetization process [40] and responsible for the observed ZFC E-B effect [41]. We could see near similar nature in variation of M R and H C1 -H C2 against Mn concentrations in figure 10(a) which further supports our viewpoint of unidirectional anisotropy.…”

Section: Study Of Magnetic Property Formentioning

confidence: 99%

Highly correlated structural, local structural, Raman spectroscopic and magnetic properties of Mn-substituted Cu₂V₂O₇

Das,

Neogi,

Banerjee

et al. 2023

J. Phys.: Condens. Matter

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Low-dimensional quantum spin ½ system Cu2V2O7 has been investigated in the framework of Mn-substitution at the Cu site, which is really un-investigated. The studied compounds Cu2 − x Mn x V2O7 (x = 0, 0.05, 0.1 and 0.15) have been synthesized and characterized structurally, spectroscopically, local structurally and magnetically via x-ray diffraction, Raman, x-ray absorption and temperature, field dependent magnetization measurements respectively. Although Cu2V2O7 can be found in α, β and γ-phase, however all of the studied compounds are found in single orthorhombic α-phase which has crucial magneto-electric application potential. Temperature dependent Raman spectra indicated anharmonic phonon–phonon scattering but there is no spin–phonon coupling for VO4 vibrational modes. The local structure probed via x-ray absorption near edge structure and extended x-ray absorption fine structure spectroscopy at 15 K, 300 K indicates Cu2+, V5+ and mixed valent Mn2+ and Mn3+ ionic states and justified local structure for the probed ions. Magnetic measurements indicate long-range antiferromagnetic ordering with doping independent Neel temperature (32.5 K). Further observations are strong magnetic hysteresis at 5 K (due to canted spin structure), zero field exchange-bias and their noteworthy enhancement upon Mn-substitution. Interesting correlation between structural parameters and magnetic exchanges has been developed.

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“…Up to now, ZFC EB has been found in some alloys, 7–10 nitrides, 11,12 oxides, 13–17 thin films. 18,19 However, only very few materials have T B values up to room temperature. It is well known that exchange bias is an interface effect.…”

Section: Introductionmentioning

confidence: 99%

Zero-field-cooling exchange bias up to room temperature in the strained kagome antiferromagnet Mn_3.1Sn_0.9

Zhao¹,

Guo²,

Wu³

et al. 2023

Mater. Horiz.

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Zero field cooled exchange bias effect in nano-crystalline Mg-ferrite thin film

Cited by 15 publications

References 55 publications

Emergent magnetism and exchange bias effect in iron oxide nanocubes with tunable phase and size

Emergent magnetism and exchange bias effect in iron oxide nanocubes with tunable phase and size

Highly correlated structural, local structural, Raman spectroscopic and magnetic properties of Mn-substituted Cu₂V₂O₇

Zero-field-cooling exchange bias up to room temperature in the strained kagome antiferromagnet Mn_3.1Sn_0.9

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Zero field cooled exchange bias effect in nano-crystalline Mg-ferrite thin film

Cited by 15 publications

References 55 publications

Emergent magnetism and exchange bias effect in iron oxide nanocubes with tunable phase and size

Emergent magnetism and exchange bias effect in iron oxide nanocubes with tunable phase and size

Highly correlated structural, local structural, Raman spectroscopic and magnetic properties of Mn-substituted Cu2V2O7

Zero-field-cooling exchange bias up to room temperature in the strained kagome antiferromagnet Mn3.1Sn0.9

Contact Info

Product

Resources

About

Highly correlated structural, local structural, Raman spectroscopic and magnetic properties of Mn-substituted Cu₂V₂O₇

Zero-field-cooling exchange bias up to room temperature in the strained kagome antiferromagnet Mn_3.1Sn_0.9