Giant magnetic-field-induced strain in Ni-Mn-Ga micropillars
نویسندگان
چکیده
منابع مشابه
Giant magnetic-field-induced strains in polycrystalline Ni-Mn-Ga foams.
The magnetic shape-memory alloy Ni-Mn-Ga shows, in monocrystalline form, a reversible magnetic-field-induced strain (MFIS) up to 10%. This strain, which is produced by twin boundaries moving solely by internal stresses generated by magnetic anisotropy energy, can be used in actuators, sensors and energy-harvesting devices. Compared with monocrystalline Ni-Mn-Ga, fine-grained Ni-Mn-Ga is much ea...
متن کامل6% magnetic-field-induced strain by twin-boundary motion in ferromagnetic Ni–Mn–Ga
Field-induced strains of 6% are reported in ferromagnetic Ni–Mn–Ga martensites at room temperature. The strains are the result of twin boundary motion driven largely by the Zeeman energy difference across the twin boundary. The strain measured parallel to the applied magnetic field is negative in the sample/field geometry used here. The strain saturates in fields of order 400 kA/m and is blocke...
متن کاملTemperature dependence of reversible field-induced strain in Ni–Mn–Ga single crystal
Temperature dependence of reversible magnetic shape memory effect and magnetization changes were studied in Ni49.7Mn29.1Ga21.2. The twinning stress, equivalent magnetic stress, switching field and maximum strain all increase with decreasing temperature. A 5–6% reversible strain is observed in the temperature range of 307–263 K and it sharply decreases to 1–2% at temperatures below 263 K. The ma...
متن کاملMagnetic field induced entropy change and magnetoelasticity in Ni-Mn-Ga alloys
The magnetocaloric effect that originates from the martensitic transition in the ferromagnetic Ni-Mn-Ga shape-memory alloy is studied. We show that this effect is controlled by the magnetostructural coupling at both the martensitic variant and magnetic domain length scales. A large entropy change induced by moderate magnetic fields is obtained for alloys in which the magnetic moment of the two ...
متن کاملReversible strain in Ni-Mn-Ga with collinear field and stress
Our previous work on ferromagnetic shape memory Ni50Mn28.7Ga21.3 demonstrates reversible compressive strains of ǫ = −4100μǫ along the [001] direction under the application of a magnetic field also along the [001] direction with no external orthogonal restoring force. The reversibility of the strains is due to internal bias stresses oriented orthogonal to the field. These results show promise fo...
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ژورنال
عنوان ژورنال: Scripta Materialia
سال: 2018
ISSN: 1359-6462
DOI: 10.1016/j.scriptamat.2018.03.020