Electric field tuning of magnetocaloric effect in FeRh0.96Pd0.04/PMN-PT composite near room temperature

Hu, Quanli; Li, Jinyan; Wang, C. C.; Zhou, Zhenjia; Cao, Qingqi; Zhou, Tiejun; Wang, D. H.; Du, Youwei

doi:10.1063/1.4984901

Cited by 40 publications

(23 citation statements)

References 43 publications

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“…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 .…”

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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“…for magnetic and spintronic applications, such as heat-assisted recording, 19-23 tunneling 24 and AFM-based memory devices, [25][26][27] magnetocalorics and barocalorics. 28,29 This AFM-FM transition has been widely studied as well from a fundamental point of view. [30][31][32][33] The temperature at which the AFM order disappears (metamagnetic transition temperature, T*) can be tailored by the application of external magnetic fields, 34 changing composition/ doping, 35,36 electrochemical processes, 37 hydrostatic pressure 38 or biaxial strain imposed by the substrate.…”

Section: New Conceptsmentioning

confidence: 99%

Local manipulation of metamagnetism by strain nanopatterning

et al. 2020

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“…[85,86] Therefore, such a large electroresistance in FeRh was coined as giant electroresistance for metals. Moreover, Hu et al [87] achieved a remarkable electric-field-controlled magnetocaloric effect in FeRh 0.96 Pd 0.04 /PMN-PT heterostructures based on the magnetic phase conversion triggered by the piezoelectric strain, which extends the electric-field approach to refrigeration applications. Moreover, Hu et al [87] achieved a remarkable electric-field-controlled magnetocaloric effect in FeRh 0.96 Pd 0.04 /PMN-PT heterostructures based on the magnetic phase conversion triggered by the piezoelectric strain, which extends the electric-field approach to refrigeration applications.…”

Section: Giant Electroresistance Modulationmentioning

confidence: 99%

Electric‐Field Control of Magnetic Order: From FeRh to Topological Antiferromagnetic Spintronics

Feng

Yan

Liu

2018

Adv Elect Materials

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approach that is capable of suppressing Joule heating is highly desirable from an energy perspective.Under this background, electric-field control of magnetism emerges in the field of multiferroics, which is expected to reduce the energy consumption of information storage by several orders of magnitude, to fJ bit −1 or even aJ bit −1 . [4][5][6][7][8][9][10][11] In single-phase multiferroic materials, which consists of more than one ferroic order, if there is coupling among different ferroic orders, for example, the magnetoelectric coupling between the ferroelectric (FE) and FM orders, the magnetism can be conveniently controlled by electrical switching of the ferroelectricity, such as in YMnO 3 , BiFeO 3 , and TbMnO 3 . However, the magnetic order in these materials is typically antiferromagnetic, which is difficult to detect, and the magnetoelectric coupling is rather weak; [12][13][14] moreover, intrinsic single-phase multiferroic materials are rare because of contradicting symmetry and physical requirements. [15] All these factors prevent single-phase multiferroic materials from practical device applications.Alternatively, the electric-field control of magnetism can be achieved in heterostructures via other means: (1) in FM/FE composite heterostructures, the magnetism of the FM thin films can be modulated by the piezoelectric strain triggered by electric fields applied onto the ferroelectric substrates; [8] (2) in FM/dielectric composite heterostructures with ultrathin FM thin films, the magnetism can be tailored by the electrostatic doping; [8] (3) in FM/multiferroic composite heterostructures, the magnetism of the FM thin film layers can be varied by electric fields through the interfacial magnetic exchange coupling, such as in Co 0.9 Fe 0.1 /BiFeO 3 heterostructures. [16] Typically, the modulation of magnetism by electric fields in multiferroic heterostructures results in variations in the magnetization, coercivity fields, or magnetic anisotropy of the ferromagnetic materials. In addition, the key scientific issue of controlling magnetic properties using an electric field has been carefully elaborated in previous Reviews. [17,18] Among them, the change of magnetization (ΔM) upon external electric fields (ΔE) yields the simplified magnetoelectric coupling coefficient (strictly speaking, the magnetoelectric coupling coefficient should be described as a tensor; please refer to the previous Reviews) [17,18] α = μ 0 ΔM/ΔE, where μ 0 is the permittivity of free space. Compared with single-phase multiferroics, α in multiferroic heterostructures can be significantly greater, for example, it reaches 1.08 × 10 −7 s m −1 Using an electric field instead of an electric current (or a magnetic field) to tailor the electronic properties of magnetic materials is promising for realizing ultralow-energy-consuming memory devices because of the suppression of Joule heating, especially when the devices are scaled down to the nanoscale. Here, recent results on giant magnetization and resistivity modulation in a metamagnetic inte...

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Electric field tuning of magnetocaloric effect in FeRh0.96Pd0.04/PMN-PT composite near room temperature

Cited by 40 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

Local manipulation of metamagnetism by strain nanopatterning

Electric‐Field Control of Magnetic Order: From FeRh to Topological Antiferromagnetic Spintronics

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