55 T long pulse magnet reinforced by ice and woven-glass cloths

Takeyama, S.; Ochimizu, Hideaki; Sasaki, Susumu; Miura, N.

doi:10.1088/0957-0233/3/7/006

Cited by 19 publications

(9 citation statements)

References 7 publications

(1 reference statement)

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“…Pulsed magnetic fields ͑H͒ up to 0 Hϭ40 T were generated in a duration time of about 20 ms utilizing a nondestructive long-pulse magnet with a capacitor bank of 300 kJ maximum stored energy. 18 Magnetization ͑M͒ was measured by means of an induction method by employing a couple of coaxial pickup coils. 19 The voltage induced in the pickup coils was recorded by a 12-bit transient recorder and integrated numerically to obtain magnetization value.…”

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confidence: 99%

High-field magnetization and magnetoresistance ofLa0.5Sr1.5MnO

et al. 1999

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͑Received 21 December 1998͒Measurements of magnetization and magnetoresistance have been made for crystals of La 0.5 Sr 1.5 MnO 4 with use of pulsed magnetic fields up to 40 T. Application of high magnetic field causes metamagnetic transitions below 217 K and concomitantly the colossal magnetoresistance effect. At low magnetic fields, change of resistivity is expressed well by a formula for hopping conduction whose activation energy decreases in proportion to the square of magnetization. In high fields, temperature dependence of resistivity cannot be explained by a simple extrapolation from the low-field region. The transition from the low-field regime to the high-field one is ascribed to the magnetic-field induced melting of the charge and orbital ordering, as evidenced by the metamagnetic transition.

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confidence: 99%

High-field magnetization and magnetoresistance ofLa0.5Sr1.5MnO

et al. 1999

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“…Pulsed magnetic fields up to 40 T were generated for pulse duration times of 8-20 ms utilising a non-destructive long-pulse magnet with a capacitor bank of 300 kJ maximum accumulation energy (Takeyama et al 1992). The magnetisation M was measured by means of an induction method by employing a pair of co-axial pick-up coils (Yamada et al 1986).…”

Section: Methodsmentioning

confidence: 99%

High-field Study of Layered Manganites R1/2Sr3/2MnO4 (R = La and Nd)

Tokunaga¹,

Miura²,

Moritomo³

1999

Aust. J. Phys.

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We have studied the effects of a magnetic field on the magnetism and transport properties of the layered manganites R1/2Sr3/2MnO4 (R = La and Nd) in pulsed magnetic fields up to 40 T. The R = La crystal shows metamagnetic-like transitions above 30 T, concomitantly with a colossal magnetoresistance (CMR) effect as large as [ρ(0) - ρ(H)]/ρ(H) > 103 with a field of µοH = 38 T at low temperatures. These transitions can be ascribed to the field-induced melting of the real-space ordering of the eg electrons (charge ordering). For the R = Nd crystal, a magnetic field along the c-axis enhances the two-dimensionality in the conductivity. Moreover, we observed metamagnetic-like transitions accompanied by the CMR effects at low temperatures, in spite of the absence of charge ordering.

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“…An interesting alternative is 'impregnation' with water that turns into ice when the coil is cooled down [121,164]. In the construction and the cool-down procedure, the expansion of the water upon freezing must be taken into account.…”

Section: Compact Wire-wound Coilsmentioning

confidence: 99%

Pulsed magnets

Herlach¹

1999

Rep. Prog. Phys.

105

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Pulsed magnets are divided into two categories: below 100 T with pulse duration in the range 1 ms-1 s, and above 100 T with pulse duration of order microsecond due to self-destruction of the coil. For both categories, simple scaling laws for the performance are given. For nondestructive magnets, these depend in the first place on the mechanical strength and electrical conductivity of the materials used in coil design; another important parameter is the size of the bore. Together with the energy and power available from the pulsed power supply, this determines peak field and pulse duration. Different types of power supply are discussed, capacitor banks as well as controlled rectification of ac power. For destructive magnets, there is a simple relation between the peak field and the velocity at which the coil structure is expanded by the magnetic force; this can be estimated from shock wave properties of the conductor. The expansion can be neutralized by imploding the coil in a flux compression experiment. High explosives as well as electromagnetic forces have been used for this purpose to obtain fields up to 2800 T. A simple and efficient method is the exploding single-turn coil; this is best suited for experiments up to 300 T.The design and performance of the different magnets is discussed in detail. A few examples for application of these magnets in experiments are given. Prospects for generating higher fields by different methods are discussed, in particular miniaturization on all levels-coils ('micro-magnets') as well as experiments.

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55 T long pulse magnet reinforced by ice and woven-glass cloths

Cited by 19 publications

References 7 publications

High-field magnetization and magnetoresistance ofLa0.5Sr1.5MnO

High-field magnetization and magnetoresistance ofLa0.5Sr1.5MnO

High-field Study of Layered Manganites R1/2Sr3/2MnO4 (R = La and Nd)

Pulsed magnets

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