Stress-assisted reversible magnetic field-induced phase transformation in Ni2MnGa magnetic shape memory alloys

Караман, И.; Karaca, H.E.; Başaran, B.; Lagoudas, Dimitris C.; Chumlyakov, Yu. I.; Maier, Hans Jürgen

doi:10.1016/j.scriptamat.2006.03.061

Cited by 73 publications

(41 citation statements)

References 16 publications

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“…In addition to the MAE, the Zeeman energy (ZE) plays an important role in magnetic field-induced phase transformations (FIPTs). [5,7] The ZE stems from the difference in the saturation magnetizations of transforming phases and increases continuously with the field [8] as shown in Figure 1b. Unlike MAE, ZE does not strongly depend on crystal orientation, which provides an opportunity to utilize polycrystals for actuator applications.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field‐Induced Phase Transformation in NiMnCoIn Magnetic Shape‐Memory Alloys—A New Actuation Mechanism with Large Work Output

Karaca

Караман

Başaran

et al. 2009

Adv Funct Materials

391

206

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Magnetic shape memory alloys (MSMAs) have recently been developed into a new class of functional materials that are capable of magnetic‐field‐induced actuation, mechanical sensing, magnetic refrigeration, and energy harvesting. In the present work, the magnetic &!hyphen;field‐induced martensitic phase transformation (FIPT) in Ni45Mn36.5Co5In13.5 MSMA single crystals is characterized as a new actuation mechanism with potential to result in ultra‐high actuation work outputs. The effects of the applied magnetic field on the transformation temperatures, magnetization, and superelastic response are investigated. The magnetic work output of NiMnCoIn alloys is determined to be more than 1 MJ m−3 per Tesla, which is one order of magnitude higher than that of the most well‐known MSMAs, i.e., NiMnGa alloys. In addition, the work output of NiMnCoIn alloys is orientation independent, potentially surpassing the need for single crystals, and not limited by a saturation magnetic field, as opposed to NiMnGa MSMAs. Experimental and theoretical transformation strains and magnetostress levels are determined as a function of crystal orientation. It is found that [111]‐oriented crystals can demonstrate a magnetostress level of 140 MPa T−1 with 1.2% axial strain under compression. These field‐induced stress and strain levels are significantly higher than those from existing piezoelectric and magnetostrictive actuators. A thermodynamical framework is introduced to comprehend the magnetic energy contributions during FIPT. The present work reveals that the magnetic FIPT mechanism is promising for magnetic actuation applications and provides new opportunities for applications requiring high actuation work‐outputs with relatively large actuation frequencies. One potential issue is the requirement for relatively high critical magnetic fields and field intervals (1.5–3 T) for the onset of FIPT and for reversible FIPT, respectively.

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Section: Introductionmentioning

confidence: 99%

Magnetic Field‐Induced Phase Transformation in NiMnCoIn Magnetic Shape‐Memory Alloys—A New Actuation Mechanism with Large Work Output

Karaca

Караман

Başaran

et al. 2009

Adv Funct Materials

391

206

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“…Since the discovery of the giant magnetostriction or large magnetic field-induced strain in Ni 2 MnGa, 1 which has meanwhile augmented to 10%, induced by reordering of martensitic twin variants under the action of an external magnetic field, 2 there is large interest in developing new magnetic shape-memory alloys ͑MSMA͒, for example, FePd, Fe 3 Pt, Ni 2 Mn͑Al, In, Sn, Sb͒, Ni 2 FeGa, and Co 2 Ni͑Al, Ga͒. The use of Ni 2 MnGa in MSM devices is partially hindered by its low martensitic transformation temperature, bad ductility in the polycrystalline state, and low blocking stress level.…”

Section: Introductionmentioning

confidence: 99%

“…The use of Ni 2 MnGa in MSM devices is partially hindered by its low martensitic transformation temperature, bad ductility in the polycrystalline state, and low blocking stress level. 3 The common approach to improve the martensitic transformation temperature is to replace Ga by excess Mn, which favorably increases the valence-electron density. As a side effect, however, antiferromagnetic exchange interactions may be induced between nearest-neighbor Mn atoms, which do not improve the magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and lattice dynamics of the magnetic shape-memory alloyCo2NiGa

et al. 2010

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In addition to the prototypical Ni-Mn-based Heusler alloys, the Co-Ni-Ga systems have recently been suggested as another prospective materials class for magnetic shape-memory applications. We provide a characterization of the dynamical properties of this material and their relation to the electronic structure within a combined experimental and theoretical approach. This relies on inelastic neutron scattering to obtain the phonon dispersion while first-principles calculations provide the link between dynamical properties and electronic structure. In contrast to Ni 2 MnGa, where the softening of the TA 2 phonon branch is related to Fermi-surface nesting, our results reveal that the respective anomalies are absent in Co-Ni-Ga, in the phonon dispersions as well as in the electronic structure. Keywords Materials Science and Engineering Disciplines Condensed Matter Physics | Materials Science and Engineering CommentsThis article is from Physical Review B 82 (2010) In addition to the prototypical Ni-Mn-based Heusler alloys, the Co-Ni-Ga systems have recently been suggested as another prospective materials class for magnetic shape-memory applications. We provide a characterization of the dynamical properties of this material and their relation to the electronic structure within a combined experimental and theoretical approach. This relies on inelastic neutron scattering to obtain the phonon dispersion while first-principles calculations provide the link between dynamical properties and electronic structure. In contrast to Ni 2 MnGa, where the softening of the TA 2 phonon branch is related to Fermisurface nesting, our results reveal that the respective anomalies are absent in Co-Ni-Ga, in the phonon dispersions as well as in the electronic structure.

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“…Furthermore, significant brittleness of the Ni 2 MnGa single crystal is a serious problem preventing application of this material. On the other hand, some trials using phase transformation itself to obtain an MFIS have been reported [5][6][7]. In Ni 2 MnGa alloys, however, a huge magnetic field is required to obtain magnetic field-induced transformation because both the P and M phases show ferromagnetism and the saturated magnetization of the M phase is comparable to that of the P phase [8].…”

Section: Introductionmentioning

confidence: 99%

NiMn-Based Metamagnetic Shape Memory Alloys

Kainuma

Ito

et al. 2009

MSF

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Abstract. The magnetic properties of the parent and martensite phases of the Ni 2 Mn 1+x Sn 1-x and Ni 2 Mn 1+x In 1-x ternary alloys and the magnetic field-induced shape memory effect obtained in NiCoMnIn alloys are reviewed, and our recent work on powder metallurgy performed for NiCoMnSn alloys is also introduced. The concentration dependence of the total magnetic moment for the parent phase in the NiMnSn alloys is very different from that in the NiMnIn alloys, and the magnetic properties of the martensite phase with low magnetization in both NiMnSn and NiMnIn alloys has been confirmed by Mössbauer examination as being paramagnetic, but not antiferromagnetic. The ductility of NiCoMnSn alloys is drastically improved by powder metallurgy using the spark plasma sintering technique, and a certain degree of metamagnetic shape memory effect has been confirmed. IntroductionSince Ullakko et al. [1] first reported a magnetic field-induced strain (MFIS) in a ferromagnetic single crystal of Ni 2 MnGa in 1996, the research in this field has drastically progressed and a huge MFIS of over 9% [2] has recently been reported. The MFIS in the Ni 2 MnGa alloys, however, is not due to the shape memory effect (SME) accompanying martensitic transformation, but rather to rearrangement of martensite variants by twin boundary migration in the martensite (M) phase. This twin boundary migration induced by a magnetic field is caused by the large crystalline magnetic anisotropy energy of the M phase with low crystal symmetry. Details on the MFIS in the Ni 2 MnGa alloys have recently been reviewed by Marioni et al. [3]. Although a large output strain and a rapid response can be confirmed in the Ni 2 MnGa alloy, the output stress is principally less than 5 MPa [4]. Furthermore, significant brittleness of the Ni 2 MnGa single crystal is a serious problem preventing application of this material. On the other hand, some trials using phase transformation itself to obtain an MFIS have been reported [5][6][7]. In Ni 2 MnGa alloys, however, a huge magnetic field is required to obtain magnetic field-induced transformation because both the P and M phases show ferromagnetism and the saturated magnetization of the M phase is comparable to that of the P phase [8]. Up to now, many Ni-based magnetic shape memory alloys (MSMAs) with similar magnetic properties, such as NiMnAl [9,10], NiCoAl [11,12], NiCoGa [12,13], NiFeGa [14,15], etc., have been reported and the characteristic features of their magnetic and martensitic transformations have been clarified.Recently, we have found an unusual transformation from a ferromagnetic P to a weak magnetic M phase in the NiMnIn-and NiMnSn-based Heusler alloys [16], which shows behaviors completely different from the previous MSMAs. These new types of magnetic shape memory alloys show many interesting phenomena derived from the unique transformation, such as magnetic field-induced phase transition, the inverse magnetocaloric effect [17,18], the giant magnetoresistance effect [19,20], giant

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Stress-assisted reversible magnetic field-induced phase transformation in Ni2MnGa magnetic shape memory alloys

Cited by 73 publications

References 16 publications

Magnetic Field‐Induced Phase Transformation in NiMnCoIn Magnetic Shape‐Memory Alloys—A New Actuation Mechanism with Large Work Output

Magnetic Field‐Induced Phase Transformation in NiMnCoIn Magnetic Shape‐Memory Alloys—A New Actuation Mechanism with Large Work Output

Electronic structure and lattice dynamics of the magnetic shape-memory alloyCo2NiGa

NiMn-Based Metamagnetic Shape Memory Alloys

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