Villari Effect at Low Strain in Magnetoactive Materials

Riesgo, G.; Elbaile, L.; Carrizo, J.; Crespo, R.D.; García, María Concepción; Torres, Yadir; Garcı́a, J.A.

doi:10.3390/ma13112472

Cited by 8 publications

(5 citation statements)

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“…In inhomogeneous magnetic fields [18], even larger deformations become possible; elongations of several hundred percent have been observed in MAE specimens [19][20][21]. Very recently, other magnetoelastic effects related to MS, the Villary effect [22,23] and the Wiedemann effect [24], have been reported in compliant (mechanically soft) MAE materials as well.…”

Section: Introductionmentioning

confidence: 99%

Giant Extensional Strain of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields

et al. 2020

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Elongations of magnetoactive elastomers (MAEs) under ascending–descending uniform magnetic fields were studied experimentally using a laboratory apparatus specifically designed to measure large extensional strains (up to 20%) in compliant MAEs. In the literature, such a phenomenon is usually denoted as giant magnetostriction. The synthesized cylindrical MAE samples were based on polydimethylsiloxane matrices filled with micrometer-sized particles of carbonyl iron. The impact of both the macroscopic shape factor of the samples and their magneto-mechanical characteristics were evaluated. For this purpose, the aspect ratio of the MAE cylindrical samples, the concentration of magnetic particles in MAEs and the effective shear modulus were systematically varied. It was shown that the magnetically induced elongation of MAE cylinders in the maximum magnetic field of about 400 kA/m, applied along the cylinder axis, grew with the increasing aspect ratio. The effect of the sample composition is discussed in terms of magnetic filler rearrangements in magnetic fields and the observed experimental tendencies are rationalized by simple theoretical estimates. The obtained results can be used for the design of new smart materials with magnetic-field-controlled deformation properties, e.g., for soft robotics.

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Section: Introductionmentioning

confidence: 99%

Giant Extensional Strain of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields

et al. 2020

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“…The inverse of magnetostriction, the Villari effect, allows change in magnetization in response to the mechanical strain. 169,170 This happens because of the presence of magnetocrystalline anisotropy. Much research has been done on strain-mediated magnetization switching using techniques such as STT, 86,171-175 SOT, 26,176,177 and VCMA.…”

Section: Strain Controlmentioning

confidence: 99%

Voltage-controlled magnetic anisotropy-based spintronic devices for magnetic memory applications: Challenges and perspectives

Mishra,

Sravani,

Bose

et al. 2024

Journal of Applied Physics

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Electronic spins provide an additional degree of freedom that can be used in modern spin-based electronic devices. Some benefits of spintronic devices include nonvolatility, energy efficiency, high endurance, and CMOS compatibility, which can be leveraged for data processing and storage applications in today's digital era. To implement such functionalities, controlling and manipulating electron spins is of prime interest. One of the efficient ways of achieving this in spintronics is to use the electric field to control electron spin or magnetism through the voltage-controlled magnetic anisotropy (VCMA) effect. VCMA avoids the movement of charges and significantly reduces the Ohmic loss. This article reviews VCMA-based spintronic devices for magnetic memory applications. First, we briefly discuss the VCMA effect and various mechanisms explaining its physical origin. We then mention various challenges in VCMA that impede it for practical VCMA-based magnetic memory. We review various techniques to address them, such as field-free switching operation, write error rate improvement, widening the operation window, enhancing the VCMA coefficient, and ensuring fast-read operation with low read disturbance. Finally, we draw conclusions outlining the future perspectives.

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“…electroactive polymers) there are no issues with electrostatic charging and no external power source is needed with the usage of permanent magnets [3]. Recent research has focused on energy harvesting with this material [4][5][6], where due to the change of magnetic properties of the material due to deformation a voltage can be induced in an electric circuit because of electromagnetic induction. The inverse effect is also possible, meaning a magnetically induced deformation of the material, which could be used for actoric applications These effects are referred to as (Pseudo) 1 -Villari effect and (Pseudo)-Magnetostriction.…”

Section: Introductionmentioning

confidence: 99%

Inductive and magnetorheological properties of soft and hard magnetic fillers in elastomers

Šimić,

Lang,

Klüppel

2023

Smart Mater. Struct.

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Magnetorheological elastomers are smart materials, that have great potential for many technical applications like intelligent semi-active dampers or energy harvesting applications. We investigate soft- and hard-magnetic filler types in typical technical elastomers under cyclic deformation regarding their influence on the electromagnetic induction and magnetic switching-ability of the compounds. The effect of vulcanization in an external magnetic field is considered leading to anisotropic samples with aligned filler particles. It is found that the soft magnetic fillers show a higher switching-ability compared to hard magnetic fillers in anisotropic samples, which is related to hysteretic and slow magnetization behaviour of hard magnetic fillers. This also leads to a negative switching effect or softening of the samples if the direction of the magnetic field is opposite to that during vulcanization, suggesting rotational motion of the particles in dependence of the outer field. The stress values and mechanical hysteresis are generally higher for the anisotropic samples, both for soft and hard magnetic fillers. This is found for quasistatic and dynamic excitations at different frequencies and can clearly be related to the alignment of particles. Nevertheless, the energy harvesting ability seems to be widely independent of this since no significant different inductive properties are found for isotropic and anisotropic samples. The possibility of a combined magnetorheological and energy harvesting application is discussed.

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Villari Effect at Low Strain in Magnetoactive Materials

Cited by 8 publications

References 50 publications

Giant Extensional Strain of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields

Giant Extensional Strain of Magnetoactive Elastomeric Cylinders in Uniform Magnetic Fields

Voltage-controlled magnetic anisotropy-based spintronic devices for magnetic memory applications: Challenges and perspectives

Inductive and magnetorheological properties of soft and hard magnetic fillers in elastomers

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