Field-Induced Strain of Shape Memory Alloy Fe–31.2%Pd Using a Capacitance Method in a Pulsed Magnetic Field

Sakon, Takuo; Takaha, Atsuo; Matsuoka, Yoshitaka; Obara, Kenji; Saito, Taku; Motokawa, M.; Fukuda, Takashi; Kakeshita, Tomoyuki

doi:10.1143/jjap.43.7467

Cited by 14 publications

(10 citation statements)

References 18 publications

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“…As seen in the figure, a large strain of about 1% with a small hysteresis is obtained at 20 K. This strain is nearly five times as large as the magnetostriction of Terfenol-D. To make use of FMSMAs as actuator materials, a quick response of strain to the magnetic field is desirable. Recently, it has been confirmed by Sakon et al, using Fe-31?2Pd 14 and Fe 3 Pt 15 , that almost the same results of MFIS shown in Fig. 5 can be induced by a pulsed magnetic field with a pulse duration of 5 ms.…”

Section: Martensitic Transformation In Fe-31?2pd Fe3pt and Ni2mngasupporting

confidence: 56%

Giant magnetic field induced strain in ferromagnetic shape memory alloys and its condition

Fukuda¹,

Kakeshita²

2008

Materials Science and Technology

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Ferromagnetic shape memory alloys are a kind of multiferroic material, in which a ferroelastic domain (variant in the martensite phase) and a magnetic domain are closely correlated. One interesting phenomenon due to this correlation is the rearrangement of variants by a magnetic field, which causes a large magnetic field induced strain of several percent. Typical alloys exhibiting such behaviour are disordered Fe–31˙2Pd, Fe3Pt (degree of order ∼0˙8) and Ni2MnGa. In the present paper, the martensitic transformation behaviour and the magnetic field induced strain have been examined for these three alloys. In addition, considering the results obtained, the condition for realising the large magnetic field induced strain will be derived and its propriety will be confirmed quantitatively.

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Section: Martensitic Transformation In Fe-31?2pd Fe3pt and Ni2mngasupporting

confidence: 56%

Giant magnetic field induced strain in ferromagnetic shape memory alloys and its condition

Fukuda¹,

Kakeshita²

2008

Materials Science and Technology

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“…On the other hand, the MFISs without a bias stress have been observed in the Fe-Pd and Fe-Pt alloys. As for a Fe-31.2%Pd (at.%) single crystal alloy, a strain of 0.4% has been observed in single-shot pulse fields at the fields of 12 kOe with a frequency of 80 Hz at 77 K, which is much lower than the martensite transformation temperature T M = 230 K [58]. With regard to the Fe 3 Pt single crystal alloy, an MFIS of 1.7% has been observed and a recoverable strain of about 0.6% has been induced in single-shot pulse fields at the fields of 20 kOe with a frequency of 160 Hz at 4.2 K in the martensite state (T M = 85 K) [59].…”

Section: Magnetic Field-induced Strain and Magnetostriction In Shape mentioning

confidence: 91%

Magneto-Structural Properties of Ni2MnGa Ferromagnetic Shape Memory Alloy in Magnetic Fields

Sakon

Adachi

Kanomata

2013

Metals

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Abstract:The purpose of this review was to investigate the correlation between magnetism and crystallographic structures as it relates to the martensite transformation of Ni 2 MnGa type alloys, which undergo martensite transformation below the Curie temperature. In particular, this paper focused on the physical properties in magnetic fields. Recent researches show that the martensite starting temperature (martensite transformation temperature) T M and the martensite to austenite transformation temperature (reverse martensite temperature) T R of Fe, Cu, or Co-doped Ni-Mn-Ga ferromagnetic shape memory alloys increase when compared to Ni 2 MnGa. These alloys show large field dependence of the martensite transformation temperature. The field dependence of the martensite transformation temperature, dT M /dB, is −4.2 K/T in Ni 41 Co 9 Mn 32 Ga 18 . The results of linear thermal strain and magnetization indicate that a magneto-structural transition occurred at T M and magnetic field influences the magnetism and also the crystal structures. Magnetocrystalline anisotropy was also determined and compared with other components of Ni 2 MnGa type shape memory alloys. In the last section, magnetic field-induced strain and magnetostriction was determined with some novel alloys. OPEN ACCESS

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“…Then, the direction of the sample was turned over, and a magnetic field was applied. Precise explanations of the magnetization measurement are reported in [17].…”

Section: Magnetization Of the Neomax Permanent Magnetmentioning

confidence: 99%

Home-made pulse magnet power supply for magnetizing permanent magnets and magnetic measurements

Sakon

Kitagawa²,

Miyaoku³

2022

Eng. Res. Express

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In this article, we propose a home-made pulse magnetic field generation system constructed using a thyristor and large capacitance capacitors to generate high magnetic fields to investigate magnetic properties and magnetize the magnet and high-performance magnetic materials at room temperature. The proposed system produced a magnetic induction (magnetic field) μ 0H of 15.6 T with the 33.6 mF capacitor and an excitation voltage of 600 V. Further, we designed a new power supply system and a pulse magnet using the commercially available pulse magnet and power supply. We found that the duration time of the magnetic fields (t d) and the generated magnetic fields were three and four times larger than those for a conventional system, respectively. We also performed magnetization of a NEOMAX permanent magnet; the coercivity (ΒCJ) was 2.0 T, and the magnetization saturated at ~4.0 T. These results suggest that we can magnetise a permanent magnet such as NEOMAX with strong magnetic fields using this system. Further, the magnetic measurements of these magnets can be performed as well. The merit of our system is that the capacitance of the capacitor bank is larger than that of other studies or general commercial power supplies. Therefore, relatively high magnetic fields with long duration time can be generated. We also performed experiments on the magnetization process (M-H) of Gd to investigate the magnetocaloric effect in high magnetic fields. The magnetic entropy change was comparable to the result of former investigation. We believe that our research can contribute to the development of permanent magnets and magnetic materials for scientific and industrial use because our system allows the generation of strong magnetic fields at room temperature.

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Field-Induced Strain of Shape Memory Alloy Fe–31.2%Pd Using a Capacitance Method in a Pulsed Magnetic Field

Cited by 14 publications

References 18 publications

Giant magnetic field induced strain in ferromagnetic shape memory alloys and its condition

Giant magnetic field induced strain in ferromagnetic shape memory alloys and its condition

Magneto-Structural Properties of Ni2MnGa Ferromagnetic Shape Memory Alloy in Magnetic Fields

Home-made pulse magnet power supply for magnetizing permanent magnets and magnetic measurements

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