Magneto-electric coupling in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" overflow="scroll"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>48</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">Rh</mml:mi></mml:mrow><mml:mrow><mml:mn>52</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>-PZT multiferroic composite

Амиров, А. А.; Rodionov, V. V.; Starkov, Ivan A.; Starkov, A. S.; Aliev, A. M.

doi:10.1016/j.jmmm.2018.02.064

Cited by 22 publications

(11 citation statements)

References 16 publications

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“…В настоящее время предложенные подходы по получению мультикалоричеких композитов различного типа связности (0-3, 2-2, 1-3) активно реализовываются и зависят от конкретных решаемых практических задач [5][6][7][8][9].…”

Section: удк: 5379unclassified

Polymer Fe-Rh / PVDF multicaloric composite

2021

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A technological protocol has been developed and a polymer magnetoelectric Fe-Rh / PVDF composite consisting of magnetocaloric particles of Fe 50 Rh 50 embedded in a polymer piezoelectric matrix of polyvinyldenfluoride has been manufactured by solvent casting method. The particles of Fe 50 Rh 50 used for the composite fabrication were obtained from an ingot of the same composition by mechanical filing. The average size of the Fe 50 Rh 50 particles fabricated by the mechanical treatment was about 50 μm. X-ray diffraction analysis demonstrates the presence of an electroactive β-phase of polyvinyldenfluoride and an ordered B2 phase corresponding to a crystal structure with a base-centered crystal lattice of Fe 50 Rh 50 , which can exhibit magnetoelectric and multicaloric effects. It was shown that the temperature of the transition from the antiferromagnetic to the ferromagnetic state for Fe 50 Rh 50 microparticles is shifted towards higher temperatures of about 500 К as a result of the mechanical action in the process of obtaining Fe-Rh particles, and in the region of about 670 K, a transition from the ferromagnetic state to the paramagnetic one was observed. It has been demonstrated that annealing of the Fe 50 Rh 50 particles at a temperature of 1000°C for 20 minutes is able to recover the magnetic properties close to the bulk sample with a same composition. It should be noted that the annealing in this protocol does not completely eliminate the content of the disordered phase corresponding to the crystal structure with a face-centered cubic lattice, to the ordered structure with base-centered lattice that is seen from the data of magnetic and X-ray diffraction measurements. For the Fe-Rh / PVDF composite, a wide magnetic phase transition of at about 387 K (AFM-FM) in the heating mode and at approximately 364 K (FM-AFM) in the cooling mode was observed, which coincides with the results of magnetic measurements obtained for the heat-treated Fe 50 Rh 50 particles. The proposed method can be used for the design of new composite magnetoelectric composites with caloric effects.

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Section: удк: 5379unclassified

Polymer Fe-Rh / PVDF multicaloric composite

2021

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“…Поскольку сплав Fe 49 Rh 51 является магнитным материалом с фазовым переходом первого рода, в котором наблюдается сильная корреляция магнитных и структурных свойств, то растяжение / сжатие, индуцируемое пьезослоем отражается на магнитном слое композита PZT / FeRh / PZT, что и наблюдается в нашем случае. Подобное поведение, к примеру, было описано в работе [13] для композита FeRh / BTO, представляющего собой пленку магнитного сплава Fe 50 Rh 50 , напыленного на пьезоэлектрическую подложку титаната бария BaTiO 3 или же в [16], где композит FeRh / PZT был изготовлен склеиванием тонких пластин магнитного сплава Fe 48 Rh 52 и пьезоэлектрика PZT. Поскольку такие системы представляют собой магнитоэлектрические композиты-мультиферроики, то основываясь на результатах теоретико-экспериментальных работ, можно заключить, что степень магнитоэлектриче-ского взаимодействия, определяющая величины смещения температуры перехода и изменения площади гистерезиса, зависит от степени механической связи между слоями, соотношения толщин слоев, их формы, а также их магнитных и пьезоэлектрических характеристик [19].…”

Section: результаты и обсуждениеunclassified

Electric field controlled magnetic phase transition in Fe49Rh51 based magnetoelectric composites

Амиров¹,

Starkov²,

Starkov³

et al. 2018

LoM

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A three-layer magnetoelectric composite PZT / FeRh / PZT consisting of a layer of a magnetic alloy Fe 49 Rh 51 and two layers of a piezoelectric lead zirconate PbZr 0.53 Ti 0.47 O 3 was fabricated and its magnetic properties were studied. The magnetic alloy Fe 49 Rh 51 from which the magnetic layer was made was obtained by induction melting from pure rhodium Rh (99.9 %) and iron Fe (99.98 %). An X-ray diffraction analysis of the alloy showed the predominance of a B2 type phase with a bcc structure with an impurity phase of type α' with a fcc structure. Elemental analysis confirmed the composition corresponding to Fe 49 Rh 51. Temperature dependences of magnetic susceptibility were measured in two regimes: with piezoelectric layers under voltage ("switch on") and without voltage ("switch off "). In the "switch off " regime a phase transition at 324 K in heating and at 315 K in cooling is observed that is different from the results for pure Fe 49 Rh 51. Application of a voltage to the opposite faces of the composite induces a mechanical stress on the magnetic layer that leads to a decrease in the magnetic susceptibility and shift of the transition temperatures to 320 K in heating and 316 K in cooling. Moreover, this mechanical stress changes the shape and area of the hysteresis, which can be used for control of magnetic properties of materials. The magnetic properties and temperature hysteresis with applied electric field have been theoretically considered and explained on the basis of the Landau-Khalatnikov equations.

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“…Furthermore, there is no change in the crystal symmetry of Fe-Rh alloys during the AFM-FM transition, while the volume expansion on transition is about 1% [20]. There are numerous methods to control the magnetic phase transition parameters and the MCE in Fe-Rh, including the use of magnetic fields [21], hydrostatic pressure [22,23], electric field-induced strain [24][25][26], mechanical and heat treatments [4,13,21,[27][28][29], chemical substitution [30,31], and ion irradiation [13,32]. While Processes 2021, 9, 772 2 of 9 the effects of external influences (such as magnetic fields and pressure) on the transition temperature is relatively clear, there is less information about how the process of heat treatment affect the phase transition in Fe-Rh alloys.…”

Section: Introductionmentioning

confidence: 99%

Thermal Hysteresis Control in Fe49Rh51 Alloy through Annealing Process

et al. 2021

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We report the results of studies of the magnetic and transport properties of Fe49Rh51 alloy prepared by different sequences of quenching and the annealing process. The temperature dependences of the relative initial magnetic permeability and resistivity are analyzed. An optimal regime consisting of annealing at 1300 K for 440 min and quenching from 1300 K to 275 K is found to observe the desired narrow antiferromagnetic–ferromagnetic transition in Fe49Rh51 alloy under cyclic conditions. This has the potential to increase the efficiency of cooling devices based on the magnetocaloric effect of magnetic materials with a first-order field-induced phase transition.

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Magneto-electric coupling in Fe48Rh52-PZT multiferroic composite

Cited by 22 publications

References 16 publications

Polymer Fe-Rh / PVDF multicaloric composite

Polymer Fe-Rh / PVDF multicaloric composite

Electric field controlled magnetic phase transition in Fe49Rh51 based magnetoelectric composites

Thermal Hysteresis Control in Fe49Rh51 Alloy through Annealing Process

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