About the Role of Fe-Ions in the Formation of Magnetocaloric Effect in Ho(Co1-xFex)2Compounds

Anikin, M. S.; Tarasov, E. N.; Kudrevatykh, N. V.; Osadchenko, V.H.; Zinin, A. V.

doi:10.12693/aphyspola.127.635

Cited by 8 publications

(2 citation statements)

References 17 publications

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“…In some cases, when there are additional centres with an uncompensated spin in the molecular structure [77,78], the MCE increases. Molecular forms of carbon, namely fullerene and its functional derivatives, attract the attention of a lot of scientists and engineers because they have high electron transfer characteristics, long-lived charge-separated states, high mobility of carriers and chemical stability [79,80]. For example, metalloporphyrin-fullerene dyades collected through axial donor-acceptor coordination have been studied in the process of photo-induced electron transfer with acceptable parameters of photocurrent and IPCE [81][82][83].…”

Section: Nanosystemsmentioning

confidence: 99%

Magnetocaloric Effect in Carbon-Containing Compounds

Korolev¹,

Ломова²,

Ramazanova³

2019

RENSIT

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The review is devoted to carbon-containing compounds with magnetic properties. It considers recent developments in the problem of synthesis and studying physico-chemical properties of single-molecule magnets (SMMs). It is shown that single-molecule magnets, such as graphene and its donor-acceptor complexes, metal complexes with Schiff 's bases, paramagnetic high-spin complexes of porphyrins/phthalocyanines, as well as 3D nanoparticles of metal oxides and hybrid composites of magnetic nanoparticles with graphene have a large and even giant magnetocaloric effect at temperatures close to room conditions, i.e. beyond the temperature range of magnetic transitions. For the first time, the behaviour of such molecular materials has been determined by a direct method on an original microcalorimetric apparatus and the first data on the interconnection between the chemical structure of their molecules and magnetothermal properties have been obtained.

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Section: Nanosystemsmentioning

confidence: 99%

Magnetocaloric Effect in Carbon-Containing Compounds

Korolev¹,

Ломова²,

Ramazanova³

2019

RENSIT

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“…Interestingly, in the RCo 2 binaries, the magnetic polarization on Co is typically driven by its itinerant electron character leading to rather low ordering temperature that was reported being of first order type [15]. The substitution of Fe to Co was expected, extending enough the ordering temperature towards room temperature, with the potential benefit of rather large variations of magnetic entropy (S) at the transition [24][25][26][27]. In order to lower and adjust the Curie temperature, even to suppress the compensation point, we have investigated the Er(Fe 1−x Co x ) 2 and R(Fe 1−x Co x ) 2 H y hydrides with R = Ho, Er for their magnetic and magnetocaloric properties, as shown in ref.…”

Section: Introductionmentioning

confidence: 98%

Magnetic and Magnetocaloric Effect of Laves Phase Compounds Er(Fe0.8−xMn0.2−yCox+y)2 with x, y = 0.0 or 0.1

Othmani

Chaaba²,

Haj-Khlifa

et al. 2020

Metals

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Magnetic and magnetocaloric effect (MCE) of the Er(Fe0.8−xMn0.2−yCox+y)2 Laves phase-type compounds have been investigated. X-ray diffraction (XRD) analysis has revealed that these compounds crystallize with the C15 type Laves phase structure (Space Group Fd-3m). The magnetization curves indicate a ferri-magnetic-ordering resulting of the antiparallel coupling between the moments of the heavy rare earth Er and the transition metal (TM). The partial substitution of Fe/Mn by Co increases the Curie temperature from 355 K for Er(Fe0.8Mn0.2)2 to 475, 550, and 555 K for Er(Fe0.7Mn0.2Co0.1)2, Er(Fe0.8Mn0.1Co0.1)2, and Er(Fe0.7Mn0.1Co0.2)2, respectively. According to the nature of the TM elements, arguments were presented forwards either Molecular Field or Spin Fluctuation Theory, even Stoner type pictures should be considered for. MCE was calculated according to the Maxwell relation based on isotherm magnetization measurements. The magnetic entropy change (−∆SM) observed on a 300–400 K temperature range can be understood in terms of a Spin Fluctuation Theory picture supported by both the different magnetic polarization levels that were shared by the TM elements and the related interatomic exchange forces.

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