First-order antiferro–ferromagnetic transition in Fe49(Rh0.93Pd0.07)51under simultaneous application of magnetic field and external pressure

Kushwaha, Pallavi; Bag, Pallab; Rawat, R.; Chaddah, P.

doi:10.1088/0953-8984/24/9/096005

Cited by 16 publications

(14 citation statements)

References 43 publications

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“…During the magnetic transition, the Fe sublattice switches from antiparallel to parallel exchange, while the Rh develops a magnetic moment of approximately 0.9 µ B 11 – 14 . The transition temperature can be tuned easily by an applied magnetic field, with a reported effect of −9 K/T 15 , 16 . In addition, other external stimuli, such as piezoelectric strain has been found to influence the magnetization of the FM phase 9 as well as the magnetocaloric properties 17 near the transition.…”

Section: Introductionmentioning

confidence: 99%

Phase Coexistence and Kinetic Arrest in the Magnetostructural Transition of the Ordered Alloy FeRh

Keavney

Choi

Holt

et al. 2018

Sci Rep

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In materials where two or more ordering degrees of freedom are closely matched in their free energies, coupling between them, or multiferroic behavior can occur. These phenomena can produce a very rich phase behavior, as well as emergent phases that offer useful properties and opportunities to reveal novel phenomena in phase transitions. The ordered alloy FeRh undergoes an antiferromagnetic to ferromagnetic phase transition at ~375 K, which illustrates the interplay between structural and magnetic order mediated by a delicate energy balance between two configurations. We have examined this transition using a combination of high-resolution x-ray structural and magnetic imaging and comprehensive x-ray magnetic circular dichroism spectroscopy. We find that the transition proceeds via a defect-driven domain nucleation and growth mechanism, with significant return point memory in both the structural and magnetic domain configurations. The domains show evidence of inhibited growth after nucleation, resulting in a quasi-2 nd order temperature behavior.Magneto-structural phase transitions offer new ways of accessing multiferroic properties, as well as a probe of the relationships between structure, magnetic and electronic ordering 1 . The phenomenology of these coupled transitions is immensely varied, as they may arise in any condensed matter system where structural, magnetic and electronic energies are closely matched. This can result in large changes of electronic/magnetic order with very subtle structural transitions. Often, materials that display such multiferroic behaviors have complex crystalline structures, with multiple avenues for distortions and symmetry changes that may result in electronic property modifications. While these materials offer much promise for discovery of new phases and applications, systems that exhibit coupled transitions with a relatively simple structural change may enable better control of the transition as well as the opportunity to study the physics of the coupling.The CsCl-structured alloy FeRh experiences a first-order structural phase transition above room temperature characterized by a ~1% isotropic volume expansion coupled with a magnetic transition from a low-temperature antiferromagnetic (AFM) phase to a high-temperature ferromagnetic (FM) phase [2][3][4][5][6][7][8][9][10] . During the magnetic transition, the Fe sublattice switches from antiparallel to parallel exchange, while the Rh develops a magnetic moment of approximately 0.9 µ B 11-14 . The transition temperature can be tuned easily by an applied magnetic field, with a reported effect of −9 K/T 15,16 . In addition, other external stimuli, such as piezoelectric strain has been found to influence the magnetization of the FM phase 9 as well as the magnetocaloric properties 17 near the transition. In epitaxial films, the isotropic expansion is modified by substrate clamping to become an out-of-plane tetragonal distortion 18 . The transition temperature may vary in films with thickness and substrate mismatch playing a role, ho...

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Section: Introductionmentioning

confidence: 99%

Phase Coexistence and Kinetic Arrest in the Magnetostructural Transition of the Ordered Alloy FeRh

Keavney

Choi

Holt

et al. 2018

Sci Rep

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“…In Fe-Rh, the symmetry-adapted straintensor component describing the structural change accompanying the AFM/FM transition is a dilatational strain (volume change), which couples to hydrostatic pressure. It is therefore expected that the transition will be more sensitive to hydrostatic pressure than to uniaxial stress, and there are indeed evidences of a strong dependence of the transition temperatures to hydrostatic pressure 33,34 . These facts point to the existence of a large barocaloric effect at the AFM/FM pressure-induced transition.…”

Section: Introductionmentioning

confidence: 99%

Barocaloric and magnetocaloric effects inFe49Rh51

et al. 2014

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We report on calorimetry under applied hydrostatic pressure and magnetic field at the antiferromagnetic (AFM)-ferromagnetic (FM) transition of Fe 49 Rh 51 . Results demonstrate the existence of a giant barocaloric effect in this alloy, a new functional property that adds to the magnetocaloric and elastocaloric effects previously reported for this alloy. All caloric effects originate from the AFM/FM transition which encompasses changes in volume, magnetization and entropy.The strong sensitivity of the transition temperatures to both hydrostatic pressure and magnetic field confers to this alloy outstanding values for the barocaloric and magnetocaloric strengths (|∆S|/∆p ∼ 12 J kg −1 K −1 kbar −1 and |∆S|/µ 0 ∆H ∼ 12 J kg −1 K −1 T −1 ). Both barocaloric and magnetocaloric effects have been found to be reproducible upon pressure and magnetic field cycling. Such a good reproducibility and the large caloric strengths make Fe-Rh alloys particularly appealing for solid-state cooling technologies at weak external stimuli.

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“…Similarly, correlation between transition temperature and its rate of change with pressure/magnetic field has been reported for a wide variety of dopant in this system. [16][17][18] Study on a disorder broadened AFM-FM transition in doped FeRh system showed that pressure and magnetic field shift transition temperature but the extent of hysteresis and the width of the transition is determined by the temperature. 18 This interplay of pressure and magnetic field in FeRh system provide an opportunity to tune the critical parameters for inducing AFM-FM transition, which can be utilized for practical applications.…”

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confidence: 99%

“…[16][17][18] Study on a disorder broadened AFM-FM transition in doped FeRh system showed that pressure and magnetic field shift transition temperature but the extent of hysteresis and the width of the transition is determined by the temperature. 18 This interplay of pressure and magnetic field in FeRh system provide an opportunity to tune the critical parameters for inducing AFM-FM transition, which can be utilized for practical applications. Here, we report giant resistivity change in Pd doped FeRh with simultaneous application of pressure and magnetic field over a wide temperature range (from 5 K to more than 300 K).…”

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confidence: 99%

“…Polycrystalline sample used in the present study is the same as used in the earlier study. 18 Resistivity (ρ) and the longitudinal magnetoresistance measurements under applied pressure are performed using Cu-Be high pressure cell from easy Lab (U.K) in the temperature range of 5 − 320 K up to 21 kbar pressure and 8 Tesla magnetic field (using superconducting magnet system from Oxford Instruments). A mixture of iso-amyl alcohol and n-pentane (1:1 volume ratio) is used as a pressure transmitting medium.…”

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Room temperature giant baroresistance and magnetoresistance and its tunability in Pd doped FeRh

Kushwaha

Bag

Rawat

2015

Applied Physics Letters

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We report room temperature giant baro-resistance (≈128%) in Fe49(Rh0.93Pd0.07) 51. With the application of external pressure and magnetic field the temperature range of giant baro-resistance (≈600% at 5K and 19.9 kbar and 8 Tesla) and magnetoresistance (≈-85% at 5K and 8 tesla) can be tuned from 5 K to well above room temperature. As the AFM state is stabilized at room temperature under external pressure, it shows giant room temperature magnetoresistance (≈-55%) with magnetic field. Due to coupled magnetic and lattice changes, the isothermal change in room temperature resistivity with pressure (in the absence of applied magnetic field) as well as magnetic field (under various constant pressure) can be scaled together to a single curve when plotted as a function of X = T + 12.8*H -7.2*P.PACS numbers: 75.30. Kz, 72.15.Gd, 75.50.Bb First order antiferromagnetic (AFM)-ferromagnetic (FM) transition in equiatomic FeRh and its derivative has been of interest for giant magnetoresistance (MR), 1-3 magnetostriction, 4-7 magnetocaloric effect (MCE), [8][9][10] glass like magnetic states 3,11 etc. The origin of AFM-FM transition, which is accompanied with large isostructural unit cell volume change and change in electrical resistance, 12 is still a subject matter of theoretical investigation. However, extensive experimental studies on this system has provided some understanding and empirical rules to tailor its functional properties. Recent demonstration of room temperature antiferromagnetic memory resistor 13 and electric field control of magnetic order 14 are examples, where these functional properties has been utilized. On the other hand, correlation between 'e/a' ratio and first order transition temperature (TN) has been shown by Barua et al. 15 which in turn is used for synthesizing new alloys with Cu and Au substitution. Similarly, correlation between transition temperature and its rate of change with pressure/magnetic field has been reported for a wide variety of dopant in this system. [16][17][18] Study on a disorder broadened AFM-FM transition in doped FeRh system showed that pressure and magnetic field shift transition temperature but the extent of hysteresis and the width of the transition is determined by the temperature. 18 This interplay of pressure and magnetic field in FeRh system provide an opportunity to tune the critical parameters for inducing AFM-FM transition, which can be utilized for practical applications. Here, we report giant resistivity change in Pd doped FeRh with simultaneous application of pressure and magnetic field over a wide temperature range (from 5 K to more than 300 K). The value of giant resistivity change at room temperature is found to be ≈128% with pressure and ≈-55% with magnetic field, which increases to about ≈600% and ≈-85% around liquid He temperature. We show that the isothermal change in resistivity with pressure and magnetic field can be scaled together.Polycrystalline sample used in the present study is the same as used in the earlier study. 18 Resistivity (ρ) and the l...

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First-order antiferro–ferromagnetic transition in Fe₄₉(Rh_0.93Pd_0.07)₅₁under simultaneous application of magnetic field and external pressure

Cited by 16 publications

References 43 publications

Phase Coexistence and Kinetic Arrest in the Magnetostructural Transition of the Ordered Alloy FeRh

Phase Coexistence and Kinetic Arrest in the Magnetostructural Transition of the Ordered Alloy FeRh

Barocaloric and magnetocaloric effects inFe49Rh51

Room temperature giant baroresistance and magnetoresistance and its tunability in Pd doped FeRh

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