Magnetic properties resulting from core-shell interactions in nanosized<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ni</mml:mtext></mml:mrow><mml:mrow><mml:mn>0.25</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Co</mml:mtext></mml:mrow><mml:mrow><mml:mn>0.25</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Zn</mml:mtext></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext

Lakshmi, N.; Bhargava, Hina; Suwalka, Omprakash; Venugopalan, K.; Sebastian, Varkey; Reddy, V. Raghavendra; Gupta, Ajay

doi:10.1103/physrevb.80.174425

Cited by 20 publications

(23 citation statements)

References 21 publications

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“…Magnetic properties of nanocrystalline Co 3 O 4 was compared with the bulk counterpart where EB effect associated with a considerable H E (350 Oe) and H C (250 Oe) were noticed along with the training effect for the nanoparticles [237]. using a combination of in-field, low-temperature Mössbauer spectroscopy and dc magnetization studies [241]. The shifts of magnetic hysteresis loop as a function of cooling was studied to characterize EB effect.…”

Section: 34mentioning

confidence: 99%

Exchange bias effect in alloys and compounds

Giri

Patra

Majumdar

2011

J. Phys.: Condens. Matter

321

225

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Abstract. The phenomenology of exchange bias effects observed in structurally single-phase alloys and compounds but composed of a variety of coexisting magnetic phases such as ferromagnetic, antiferromagnetic, ferrimagnetic, spin-glass, clusterglass, disordered magnetic states are reviewed. The investigations on exchange bias effects are discussed in diverse types of alloys and compounds where qualitative and quantitative aspects of magnetism are focused based on macroscopic experimental tools such as magnetization and magnetoresistance measurements. Here, we focus on improvement of fundamental issues of the exchange bias effects rather than on their technological importance.

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Section: 34mentioning

confidence: 99%

Exchange bias effect in alloys and compounds

Giri

Patra

Majumdar

2011

J. Phys.: Condens. Matter

321

225

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“…M-H loops measured at 20 K do not saturate at the highest field of 1 T used in the present study which is expected since in ultra-fine particles the anisotropy fields, H k , are very large and can be of the order of 20 T or more [4]. The saturation magnetization (σ S in Am 2 /kg) values in the present study have thus been obtained by plotting 1/H against magnetization of the initial curves and extrapolating the 1/H curve to zero.…”

Section: Magnetization Studiesmentioning

confidence: 59%

“…From the fundamental perspective, nano ferrites, which find wide uses ranging from the medical/biological to the highly competitive high density recording [2,3], have also proved to be excellent systems to study different types of magnetic behaviour arising from finite size effects. These include exchange bias present due to the antiferromagnetic surface (shell) and ferromagnetic core [4], change in magnetic parameters like coercivity and saturation magnetization etc. all of which are tunable by a variation of size through as simple a process as adoption of different annealing temperatures and/or substitution of one type of cation with another and can give rise to trends in the nano limit which are opposite to that in the bulk as is the case in the samples reported in this study.…”

Section: Introductionmentioning

confidence: 99%

Low temperature Mössbauer and DC magnetization studies in nano-sized Ni substituted Co–Zn ferrites

et al. 2011

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Studies in the series of nano ferrites pertaining to the stoichiometry Ni x Co 0.5−x Zn 0.5 Fe 2 O 4 , (0≤ x ≤0.5) show that contrary to the trend in bulk Co-Zn and Ni-Zn ferrites, the observed saturation magnetization of Ni-Zn ferrite (x = 0.5) is larger than Co-Zn ferrite (x = 0) and are due to finite size effects. This is evident from calculations which show that the magnetic particle sizes are 1.6 nm for Co-Zn ferrite and 2.4 nm for Ni-Zn whereas their average crystallite sizes are 5 to 3 nm respectively. Low temperature Mössbauer spectroscopic studies show that this can be attributed to an increase in an ordered core with the increase in Ni content which is reflected as a corresponding increase in the saturation magnetization.

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“…%) that indicate the systems' demagnetized state. 28,29 On the other hand, a positive DM value ðDM > 0Þ favoring the exchange interaction is observed in Fe8%Cr. At room temperature, the DM values are negative for all samples.…”

mentioning

confidence: 96%

Magnetic interaction reversal in watermelon nanostructured Cr-doped Fe nanoclusters

Kaur

Dai

Bowden

et al. 2013

Applied Physics Letters

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Cr-doped core-shell Fe/Fe-oxide nanoclusters (NCs) were synthesized at varied atomic percentages of Cr from 0 at. % to 8 at. %. The low concentrations of Cr (<10 at. %) were selected in order to inhibit the complete conversion of the Fe-oxide shell to Cr2O3 and the Fe core to FeCr alloy. The magnetic interaction in Fe/Fe-oxide NCs (∼25 nm) can be controlled by antiferromagnetic Cr-dopant. We report the origin of σ-FeCr phase at very low Cr concentration (2 at. %) unlike in previous studies, and the interaction reversal from dipolar to exchange interaction in watermelon-like Cr-doped core-shell NCs.

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Magnetic properties resulting from core-shell interactions in nanosizedNi0.25Co0.25Zn0.5

Cited by 20 publications

References 21 publications

Exchange bias effect in alloys and compounds

Exchange bias effect in alloys and compounds

Low temperature Mössbauer and DC magnetization studies in nano-sized Ni substituted Co–Zn ferrites

Magnetic interaction reversal in watermelon nanostructured Cr-doped Fe nanoclusters

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