Predicting magnetostructural trends in FeRh-based ternary systems

Barua, Radhika; Jiménez-Villacorta, Félix; Lewis, L. H.

doi:10.1063/1.4820583

Cited by 75 publications

(59 citation statements)

References 40 publications

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“…Furthermore, if the AFM to FM transition is induced by an applied magnetic field, a pronounced magnetoresistance (MR) effect is found experimentally with a measured MR ratio ∼ 50% at room temperature [2][3][4]. The temperature of the metamagnetic transition as well as the MR ratio can be tuned by addition of small amounts of impurities [2,[5][6][7][8]. These properties make FeRh-based materials very attractive for future applications in data storage devices.…”

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confidence: 90%

Temperature-dependent transport properties of FeRh

et al. 2017

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The finite-temperature transport properties of FeRh compounds are investigated by first-principles Density Functional Theory-based calculations. The focus is on the behavior of the longitudinal resistivity with rising temperature, which exhibits an abrupt decrease at the metamagnetic transition point, T = Tm between ferro-and antiferromagnetic phases. A detailed electronic structure investigation for T ≥ 0 K explains this feature and demonstrates the important role of (i) the difference of the electronic structure at the Fermi level between the two magnetically ordered states and (ii) the different degree of thermally induced magnetic disorder in the vicinity of Tm, giving different contributions to the resistivity. To support these conclusions, we also describe the temperature dependence of the spin-orbit induced anomalous Hall resistivity and Gilbert damping parameter. For the various response quantities considered the impact of thermal lattice vibrations and spin fluctuations on their temperature dependence is investigated in detail. Comparison with corresponding experimental data finds in general a very good agreement. PACS numbers: Valid PACS appear hereFor a long time the ordered equiatomic FeRh alloy has attracted much attention owing to its intriguing temperature dependent magnetic and magnetotransport properties. The crux of these features of this CsCl-structured material is the first order transition from an antiferromagnetic (AFM) to ferromagnetic (FM) state when the temperature is increased above T m = 320 K [1,2]. In this context the drop of the electrical resistivity that is observed across the metamagnetic transition is of central interest. Furthermore, if the AFM to FM transition is induced by an applied magnetic field, a pronounced magnetoresistance (MR) effect is found experimentally with a measured MR ratio ∼ 50% at room temperature [2][3][4]. The temperature of the metamagnetic transition as well as the MR ratio can be tuned by addition of small amounts of impurities [2,[5][6][7][8]. These properties make FeRh-based materials very attractive for future applications in data storage devices. The origin of the large MR effect in FeRh, however, is still under debate. Suzuki et al. [9] suggest that, for deposited thin FeRh films, the main mechanism stems from the spin-dependent scattering of conducting electrons on localized magnetic moments associated with partially occupied electronic dstates [10] at grain boundaries. Kobayashi et al. [11] have also discussed the MR effect in the bulk ordered FeRh system attributing its origin to the modification of the Fermi surface across the metamagnetic transition. So far only one theoretical investigation of the MR effect in FeRh has been carried out on an ab-initio level [12].The present study is based on spin-polarized, electronic structure calculations using the fully relativistic multiple scattering KKR (Korringa-Kohn-Rostoker) Green function method [13][14][15]. This approach allowed to calculate the transport properties of FeRh at finite temperature...

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Temperature-dependent transport properties of FeRh

et al. 2017

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“…heating effect onto the small volume specimen [13], [22]. Because of the elemental substitution effect due to a Pd doping [9], the phase transition temperature of FeRhPd films was decreased to around room temperature whereas that of an equiatomic FeRh alloy is around 370 K [1]. As the M -T trace makes a temperature hysteresis loop on heating and cooling arms, two transition temperatures can be determined corresponding to the two arms.…”

Section: Experimental Techniquementioning

confidence: 99%

“…This phase transition is accompanied by a large change in longitudinal and Hall resistivity [2]- [4], lattice constant [5] and entropy [6], [7]. The transition temperature is tunable around room temperature by a control of chemical composition [8], [9], so FeRh alloys are candidate materials for several applications such as heat-assisted magnetic recording [10], [11], AFM memories [12], [13], and memristor devices [14].…”

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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“…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.…”

Section: Ugc-dae Consortium For Scientific Research University Campumentioning

confidence: 99%

“…In fact change in valence electron per atom for Ni as well as Pd substitution and its effect on first order transition is shown to be similar. 15 Opposing influence of P and H on TN has been used to study the role of P, H and T in determining the width of transition and the extent of hysteresis 18 . This study also showed that field derivative of isothermal magnetoresistance measured for various P values for a given T have similar field dependence except for shift in critical field.…”

Section: Ugc-dae Consortium For Scientific Research University Campumentioning

confidence: 99%

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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Predicting magnetostructural trends in FeRh-based ternary systems

Cited by 75 publications

References 40 publications

Temperature-dependent transport properties of FeRh

Temperature-dependent transport properties of FeRh

Magnetothermodynamic Properties and Anomalous Magnetic Phase Transition in FeRh Nanowires

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

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