Structural evidence for stabilized ferromagnetism in epitaxial FeRh nanoislands

Loving, Melissa; Jimenez-Villacorta, F.; Kaeswurm, B.; Arena, D. A.; Marrows, C. H.; Lewis, L. H.

doi:10.1088/0022-3727/46/16/162002

Cited by 54 publications

(25 citation statements)

References 20 publications

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“…Despite this significant structural difference we observed a similar asymmetry in the transition when patterned into stripes ( Supplementary Fig. 4 ) demonstrating that the asymmetry is not the result of strain relaxation due to patterning 50 or specifics of the crystallographic orientation.…”

Section: Resultsmentioning

confidence: 70%

Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes

2016

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Coupled order parameters in phase-transition materials can be controlled using various driving forces such as temperature, magnetic and electric field, strain, spin-polarized currents and optical pulses. Tuning the material properties to achieve efficient transitions would enable fast and low-power electronic devices. Here we show that the first-order metamagnetic phase transition in FeRh films becomes strongly asymmetric in mesoscale structures. In patterned FeRh stripes we observed pronounced supercooling and an avalanche-like abrupt transition from the ferromagnetic to the antiferromagnetic phase, while the reverse transition remains nearly continuous over a broad temperature range. Although modest asymmetry signatures have been found in FeRh films, the effect is dramatically enhanced at the mesoscale. The activation volume of the antiferromagnetic phase is more than two orders of magnitude larger than typical magnetic heterogeneities observed in films. The collective behaviour upon cooling results from the role of long-range ferromagnetic exchange correlations that become important at the mesoscale and should be a general property of first-order metamagnetic phase transitions.

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Section: Resultsmentioning

confidence: 70%

Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes

2016

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“…Each spin on the upper layer is connected to the corresponding magnetic atoms on the lower layer with an exchange interaction J R (J R 40.0). As noted in [9][10][11], these choices come from the experimental facts [15][16][17].…”

Section: Models and Formulationmentioning

confidence: 99%

Frustration in a transverse Ising nanoisland with an antiferromagnetic spin configuration

Kaneyoshi¹

2015

Physica B: Condensed Matter

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“…Recently, asymmetric behavior around the AFM -FM phase transition of FeRh alloys has been reported on some tiny sample structures, such as ultra-thin films with an islandlike morphology [15] and nanoparticles [16]. Remarkably, a discontinuous and asymmetric resistance change around the phase transition was reported in submicron wires of FeRh alloy [17], [18].…”

Section: Introductionmentioning

confidence: 99%

Magnetothermodynamic Properties and Anomalous Magnetic Phase Transition in FeRh Nanowires

et al. 2018

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Thermal properties of submicron wires of Pd-doped FeRh alloys are evaluated from measurements of transport properties around the first order antiferromagnetic to ferromagnetic phase transition. Recently, in a submicron wire of FeRh alloy, an asymmetric structure between heating and cooling processes was reported in the vicinity of the phase transition temperature. A system where finitesize effects appear is expected to show different magnetic and thermal properties from those in bulk and thin film. However, thermal or magnetization measurements are difficult to perform on samples with such a tiny volume. Here, we demonstrate a quantitative evaluation of thermal properties in thin films and submicron wires of B2-ordered Pd-doped FeRh alloy grown on MgO (001). Resistivity measurements on a series of wires with different width reveal that the anomaly in the resistance change is enhanced in narrow wires. As the transport properties in submicron wires sensitively reflect those magnetic states, the entropy change and irreversible energy loss during the first order phase transition have been determined via resistance measurements. We find a larger energy loss in smaller samples where wider hysteresis loops appear in temperature-driven measurements. This method can be a probe to evaluate the finitesize effect induced by a restricted magnetic domain nucleation process during the phase transition.Index Terms-FeRh alloys, first order phase transition, metamagnetic transition, thin films, submicron wires.

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Structural evidence for stabilized ferromagnetism in epitaxial FeRh nanoislands

Cited by 54 publications

References 20 publications

Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes

Colossal magnetic phase transition asymmetry in mesoscale FeRh stripes

Frustration in a transverse Ising nanoisland with an antiferromagnetic spin configuration

Magnetothermodynamic Properties and Anomalous Magnetic Phase Transition in FeRh Nanowires

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