Bulk-like first-order magnetoelastic transition in FeRh particles

Biswas, Anis; Gupta, Somesh; Clifford, Dustin M.; Mudryk, Yaroslav; Hadimani, Ravi L.; Barua, Radhika; Pecharsky, V. K.

doi:10.1016/j.jallcom.2022.165993

Cited by 6 publications

(5 citation statements)

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“…The emergence of asymmetric thermal magnetization hysteresis, with a relatively abrupt transition during heating and a broad transition during cooling, has been frequently observed in FeRh specimens in the literature. Examples include fine particle and powder systems synthesized via solid-phase reduction and mechanochemical methods. , A particularly prominent case is that of (ultra)thin FeRh films grown on single-crystal oxide substrates, which often turn out to be discontinuous or granular. − We suggest that a substantial presence of supercooled nanoscale grains within FeRh films could explain the appearance of such asymmetric thermal hysteresis. It is worth noting that engineering the sputter process can improve to a certain degree the continuity and smoothness of ultrathin FeRh films on oxide substrates …”

Section: Resultsmentioning

confidence: 99%

“…Examples include fine particle and powder systems synthesized via solid-phase reduction and mechanochemical methods. 30,31 A particularly prominent case is that of (ultra)thin FeRh films grown on single-crystal oxide substrates, which often turn out to be discontinuous or granular. 54−58 We suggest that a substantial presence of supercooled nanoscale grains within FeRh films could explain the appearance of such asymmetric thermal hysteresis.…”

Section: Resultsmentioning

confidence: 99%

“…30 Additionally, Biswas et al have succeeded in obtaining an abrupt phase transition in FeRh powders, which feature interconnected particles of 0.6−1 μm in size. 31 On the other hand, FeRh nanoislands with sizes in the range of 10−100 nm and supported on crystal substrates have been fabricated using self-organization during physical vapor deposition. This strategy exploits the Volmer−Weber growth mode during high-temperature deposition of FeRh on singlecrystal MgO, resulting in the nucleation of physically separated epitaxial islands.…”

Section: Introductionmentioning

confidence: 99%

“…On the one hand, solution-phase chemical methods lead to nanoparticles with sizes between 3 and 20 nm. , Typically, only a minor fraction of the synthesized sample undergoes the phase transition, which is likely caused by the presence of fcc-ordered FeRh, where the transition is inherently absent. , More recently, Cao et al reported the fabrication of bcc-like particulate FeRh alloys with a more prominent AF–FM phase transition, although the residual magnetization at low temperatures was still relatively large . Additionally, Biswas et al have succeeded in obtaining an abrupt phase transition in FeRh powders, which feature interconnected particles of 0.6–1 μm in size …”

Section: Introductionmentioning

confidence: 99%

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Preserving Metamagnetism in Self-Assembled FeRh Nanomagnets

Motyčková

Arregi

Staňo

et al. 2023

ACS Appl. Mater. Interfaces

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Preparing and exploiting phase-change materials in the nanoscale form is an ongoing challenge for advanced material research. A common lasting obstacle is preserving the desired functionality present in the bulk form. Here, we present self-assembly routes of metamagnetic FeRh nanoislands with tunable sizes and shapes. While the phase transition between antiferromagnetic and ferromagnetic orders is largely suppressed in nanoislands formed on oxide substrates via thermodynamic nucleation, we find that nanomagnet arrays formed through solid-state dewetting keep their metamagnetic character. This behavior is strongly dependent on the resulting crystal faceting of the nanoislands, which is characteristic of each assembly route. Comparing the calculated surface energies for each magnetic phase of the nanoislands reveals that metamagnetism can be suppressed or allowed by specific geometrical configurations of the facets. Furthermore, we find that spatial confinement leads to very pronounced supercooling and the absence of phase separation in the nanoislands. Finally, the supported nanomagnets are chemically etched away from the substrates to inspect the phase transition properties of self-standing nanoparticles. We demonstrate that solid-state dewetting is a feasible and scalable way to obtain supported and free-standing FeRh nanomagnets with preserved metamagnetism.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preserving Metamagnetism in Self-Assembled FeRh Nanomagnets

Motyčková

Arregi

Staňo

et al. 2023

ACS Appl. Mater. Interfaces

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show abstract

“…According to Biswas et al 46 , the broad metamagnetic transition could be attributed to surface defects present in a nanogranular system that slow down the kinetics of growth of the new phase. Motyckova et al 28 report similar thermal magnetization curves on self-assembled of sub-micron FeRh nanoislands capable of sustaining a supercooled state at about 150-200 K below their transition temperature to FM states.…”

Section: Global Magnetic Measurementsmentioning

confidence: 99%