100 T magnet developed in Osaka

Kindo, Koichi

doi:10.1016/s0921-4526(00)00725-0

Cited by 66 publications

(24 citation statements)

References 5 publications

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“…MT measurements were performed by a Vibration Sample Magnetometer and a SQUIDmagnetometer at a sweeping speed of 2 K/min. Magnetization measurements under a pulsed magnetic field up to 55 T were measured by induction using coaxial pickup coils [20] at the Institute for Solid State Physics, the University of Tokyo. …”

Section: Methodsmentioning

confidence: 99%

The Thermal Transformation Arrest Phenomenon in NiCoMnAl Heusler Alloys

Ito

Tokunaga

et al. 2013

Metals

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In this report, we present findings of systematic research on NiCoMnAl alloys, with the purpose of acquiring a higher thermal transformation arrest temperature (T A ). By systematic research, T A in the NiCoMnAl alloy systems was raised up to 190 K, compared to the highest T A of 130 K in NiCoMnIn. For a selected alloy of Ni 40 Co 10 Mn 33 Al 17 , magnetization measurements were performed under a pulsed high magnetic field, and the critical magnetic field-temperature phase diagram was determined. The magnetic phase diagram for Ni 50−x Co x Mn 50−y Al y was also established. Moreover, from the discussion that the formerly called "kinetic arrest phenomenon" has both thermodynamic and kinetic factors, we suggest a terminology change to the "thermal transformation arrest phenomenon".

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Section: Methodsmentioning

confidence: 99%

The Thermal Transformation Arrest Phenomenon in NiCoMnAl Heusler Alloys

Ito

Tokunaga

et al. 2013

Metals

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“…Thermomagnetization (MT) measurements were performed by a superconducting quantum interference device (SQUID) magnetometer ranging from 6 to 350 K (300 K for 7 T). Isothermal magnetization up to 45 T was measured by induction using coaxial pickup coils 17) at the Institute for Solid State Physics, the University of Tokyo.…”

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confidence: 99%

Kinetic Arrest of Martensitic Transformation in NiCoMnAl Metamagnetic Shape Memory Alloy

Ito

Tokunaga

et al. 2010

Mater. Trans.

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Magnetic properties and martensitic transformation behaviors of NiCoMnAl metamagnetic shape memory alloys were investigated. The kinetic arrest phenomenon was observed at about 40 K during thermomagnetization measurements. At temperatures ranging from 4.2 to 200 K, magnetic field-induced reverse transformation was confirmed by a pulse magnetometer with a magnetic field up to 45 T. By plotting the equilibrium magnetic fields against the measured temperature, the transformation entropy change was calculated by using the ClausiusClapeyron equation. The transformation entropy change was found to become zero below 40 K, which can explain the appearance of the kinetic arrest phenomenon. An unusual type of ferromagnetic shape memory (SM) alloy has been recently found in Ni-Mn-X (X ¼ In, Sn, and Sb) Heusler alloys, 1) for which the parent phase shows much stronger magnetism than that of the martensite phase.2-5) As a result, during martensitic transformation a drastic change in magnetization can be observed in thermomagnetization measurement. In these alloys, the martensitic transformation temperatures drastically decrease with increasing magnetic field if the specimen is subjected to field cooling. Furthermore, a magnetic field-induced transformation, namely, metamagnetic phase transformation (MMPT), has also been reported in NiCoMnIn, 6) NiCoMnSn, 7)NiCoMnGa, 8) NiCoMnSb 9) and NiCoMnAl 10) alloys, and an almost perfect magnetic field-induced SM effect, that is, the metamagnetic SM effect, at room temperature has been confirmed in single crystalline Ni 45 Co 5 Mn 36:7 In 13:3 6,11) and polycrystalline Ni 43 Co 7 Mn 39 Sn 11 7) alloys. For NiCoMnAl alloys, it has also been reported that the grain boundaries have relatively high strength and that even polycrystalline samples can be subjected to compression and deformation. Additionally, due to its low cost, the potential for practical application has also been pointed out.Very recently, for

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“…The magnetic fields are generated in the solenoid magnet coil by discharging the energy stored in the capacitor bank [38]. Figure 1(b) shows the time variations of the pulsed fields generated in the nondestructive magnet installed at the Institute for Solid State Physics (ISSP), the University of Tokyo.…”

Section: Thermodynamics Of Mcementioning

confidence: 99%

Magnetocaloric Effects in Metamagnetic Shape Memory Alloys

Kihara¹,

Xu²,

Ito³

et al. 2017

Shape Memory Alloys - Fundamentals and Applications

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Recently, metamagnetic shape memory alloys have attracted much attention as candidates for the rare-earth free magnetic refrigerants. These materials undergo the martensitic transformation (MT) at around room temperature accompanied by a significant entropy change. The application of the magnetic field at the low-temperature martensitic phase realizes the magnetic field-induced martensitic transformation (MFIMT). Through the MFIMT, the materials show an unconventional magnetocaloric effect (MCE), which is called inverse magnetocaloric effect (IMCE). In this chapter, the direct measurement system of MCE in pulsed-high-magnetic fields is introduced. With taking the advantage of the fast field-sweep rate of pulsed field, adiabatic measurements of MCE are carried out at various temperatures. Using this technique, the IMCEs of the metamagnetic shape memory alloys NiCoMnIn and NiCoMnGa are directly measured as adiabatic temperature changes in pulsed fields. From the experimental data of MCE for NiCoMnIn, the entropy of spin system in the austenite phase is estimated through a simple mean-field model. By the combination of MCE, magnetization and specific heat measurements, the electronic, lattice and magnetic contributions to the IMCE are individually evaluated. The result for NiCoMnIn demonstrates that lattice entropy plays the dominant role for IMCE in this material.

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100 T magnet developed in Osaka

Cited by 66 publications

References 5 publications

The Thermal Transformation Arrest Phenomenon in NiCoMnAl Heusler Alloys

The Thermal Transformation Arrest Phenomenon in NiCoMnAl Heusler Alloys

Kinetic Arrest of Martensitic Transformation in NiCoMnAl Metamagnetic Shape Memory Alloy

Magnetocaloric Effects in Metamagnetic Shape Memory Alloys

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