Magnetocaloric Properties of Fe-Ni-Cr Nanoparticles for Active Cooling

Chaudhary, Varun; Ramanujan, R.V.

doi:10.1038/srep35156

Cited by 84 publications

(38 citation statements)

References 51 publications

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“…Thereafter various first order and second order phase transition materials have been explored as refrigerants where FeRh alloys showed the largest MCE . Presently, the second order phase transition magnetic materials that show appreciable magnetocaloric effect near room temperature and large relative cooling power (RCP) are of special interest due to their non‐toxicity, economical compared to rare earth elements, and facile processing methods . In which, spinel ferrites are attracted the researchers as their magnetic properties such as single domain superparamagnetism, magnetic transition temperature, and/or the blocking temperature ( T B ) are tunable by the particle size and its distribution, morphology, and the stoichiometry .…”

Section: Introductionmentioning

confidence: 99%

Magnetocaloric Effect and Universal Curve Behavior in Superparamagnetic Zinc Ferrite Nanoparticles Synthesized via Microwave Assisted Co‐Precipitation Method

Prabhakaran

Viswanathan

Denardin³

2018

Physica Status Solidi (a)

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Single domain superparamagnetic zinc ferrite nanoparticles are synthesized through microwave assisted co‐precipitation method. Single phase and cubic spinel zinc ferrite nanoparticles shows the narrow particle size distribution with an average particle size of 5.07 nm. They exhibits superparamagnetic nature at 290 K and ferromagnetism at 5 K with a blocking temperature of around 25 K. The magnetic entropy change calculated from the set of isothermal magnetization curves shows the maximum entropy change of −0.652 J kg−1 K−1 at 135 K and large relative cooling power (RCP) of 187 J kg−1 for the field of 40 kOe. The synthesized zinc ferrite nanoparticles exhibits large magnetic anisotropy constant of 12.625 × 106 erg cm−3 with an appreciable magnetic entropy change. The field dependence of maximum magnetic entropy change and RCP values is discussed by using power law equations. Furthermore, an attempt is made to study the phenomenological curve behavior of magnetic entropy change for the zinc ferrite nanoparticles. Interestingly, the magnetic entropy change at the range of magnetic fields collapses into a single universal phenomenological curve when rescaling the temperature axis with two reference temperatures. The obtained results conveys that the zinc ferrite nanoparticles is prospective magnetic refrigerant for miniaturized devices.

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Section: Introductionmentioning

confidence: 99%

Magnetocaloric Effect and Universal Curve Behavior in Superparamagnetic Zinc Ferrite Nanoparticles Synthesized via Microwave Assisted Co‐Precipitation Method

Prabhakaran

Viswanathan

Denardin³

2018

Physica Status Solidi (a)

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“…This suggests that the volume fraction of FM contributions decreases as Cr concentration is increased. Differences between ZFC and FC magnetization curves and the maxima (T S ) in ZFC curves are commonly credited to the existence of canonical spin glass, cluster glass, or superparamagnetic phases [50]. However, FC magnetization below T irr is not constant here, as in canonical spin glasses, but continues to increase with decreasing temperature.…”

Section: E Determination Of the Magnetic Statementioning

confidence: 99%

“…Beyond hyperthermia treatment, however, Ni 1−x Cr x nanoparticles with tunable T C can be used as a supporting substrate for Ni-based taps and magnetic resonance imaging applications, where reduced ferromagnetism is desirable to avoid unwanted hysteresis losses [49]. Further, controlling the T C around room temperature may pave the way for more advanced magnetocaloric applications of M-Cr nanoclusters: for instance, miniaturized versions of thin film devices such as for coolers on chips [49,50].…”

Section: -8mentioning

confidence: 99%

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Tuning the onset of ferromagnetism in heterogeneous bimetallic nanoparticles by gas phase doping

Bohra

Grammatikopoulos

Singh

et al. 2017

Phys. Rev. Materials

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In the nanoregime, chemical species can reorganize in ways not predicted by their equilibrium bulk behavior. Here, we engineer Ni-Cr nanoalloys at the magnetic end of their compositional range (i.e., 0-15 at. % Cr), and we investigate the effect of Cr incorporation on their structural stability and resultant magnetic ordering. To ensure their stoichiometric compositions, the nanoalloys are grown by cluster beam deposition, a method that allows one-step, chemical-free fabrication of bimetallic nanoparticles. While full Cr segregation toward nanoparticle surfaces is thermodynamically expected for low Cr concentrations, metastability occurs as the Cr dopant level increases in the form of residual Cr in the core region, yielding desirable magnetic properties in a compensatory manner. Using nudged elastic band calculations, residual Cr in the core is explained based on modifications in the local environment of individual Cr atoms. The resultant competition between ferromagnetic and antiferromagnetic ordering gives rise to a wide assortment of interesting phenomena, such as a cluster-glass ground state at very low temperatures and an increase in Curie temperature values. We emphasize the importance of obtaining the commonly elusive magnetic nanophase diagram for M-Cr (M = Fe, Co, and Ni) nanoalloys, and we propose an efficient single-parameter method of tuning the Curie temperature for various technological applications.

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“…Iron and cobalt metallic magnetic nanoparticles have been less studied than their oxides and alloys . The major reason for this is that these nanoparticles are pyrophoric and, hence, are difficult to synthesize.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Synthesis of Iron and Cobalt Magnetic Metal Nanoparticles and Iron/Calcium Oxide and Cobalt/Calcium Oxide Nanocomposites

et al. 2018

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We report an environmentally benign and cost‐effective method to produce Fe and Co magnetic metal nanoparticles as well as the Fe/Cao and Co/CaO nanocomposites by using a novel, dry mechanochemical process. Mechanochemical milling of metal oxides with a suitable reducing agent resulted in the production of magnetic metal nanoparticles. The process involved grinding and consequent reduction of low‐costing oxide powders, unlike conventional processing techniques involving metal salts or metal complexes. Calcium granules were used as the reducing agent. Magnetometry measurements were performed over a large range of temperatures, from 10 to 1273 K, to evaluate the Curie temperature, blocking temperature, irreversibility temperature, saturation magnetization, and coercivity. The saturation magnetizations of the iron and cobalt nanoparticles were found to be 191 and 102 emu g−1, respectively. The heating abilities of these nanoparticles suspended in several liquids under alternating magnetic fields were measured and the specific loss power was determined. Our results suggest that the dry mechanochemical process is a robust method to produce metallic nanoparticles and nanocomposites.

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Magnetocaloric Properties of Fe-Ni-Cr Nanoparticles for Active Cooling

Cited by 84 publications

References 51 publications

Magnetocaloric Effect and Universal Curve Behavior in Superparamagnetic Zinc Ferrite Nanoparticles Synthesized via Microwave Assisted Co‐Precipitation Method

Magnetocaloric Effect and Universal Curve Behavior in Superparamagnetic Zinc Ferrite Nanoparticles Synthesized via Microwave Assisted Co‐Precipitation Method

Tuning the onset of ferromagnetism in heterogeneous bimetallic nanoparticles by gas phase doping

Mechanochemical Synthesis of Iron and Cobalt Magnetic Metal Nanoparticles and Iron/Calcium Oxide and Cobalt/Calcium Oxide Nanocomposites

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