Reduction of magnetic field in vehicle of superconducting maglev train

Sasakawa, Takashi; Tagawa, Naoto

doi:10.1109/20.908938

Cited by 19 publications

(6 citation statements)

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“…Such FM-AFM transitions are suitable for heat assisted magnetic recording (HAMR) technologies. [19][20][21][22] MnPt5As crystallizes in a layered tetragonal structure with the space group of P4/mmm, analogous to one of the well-known heavy fermion superconductors, CeCoIn5. 23,24 MnPt5As was reported to order ferromagnetically with a large magnetic moment of 3.6 μB on Mn at room temperature (TC ~ 301 K), indicating a strong Mn-Mn FM exchange interaction.…”

Section: Introductionmentioning

confidence: 99%

“…The subtle changes in chemical bonds become decisive for the physical behaviors, for example, magnetism . Over the past decades, complex intermetallic compounds have been synthesized containing magnetically active Mn atoms with various Mn–Mn configurations, allowing the studies of magnetic exchange as a function of atomic distances and chemical bonding interactions. − The previous studies revealed a consistent conclusion that magnetic ordering originated from the Mn–Mn interlayer exchange interaction is extremely sensitive to lattice constants of the unit cell and atomic distances due to thermal expansion. − Moreover, the transformation between ferromagnetic (FM) states and antiferromagnetic (AFM) states can be controlled and manipulated by temperature, pressure, magnetic field (spin-flop), and chemical doping in several systems, such as RMn 6 X 6 − and RMn 2 X 2 (R = rare-earth elements; X = Sn/Ge). − Such FM-AFM transitions are suitable for heat assisted magnetic recording (HAMR) technologies. − …”

Section: Introductionmentioning

confidence: 99%

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Chemical Bonding Governs Complex Magnetism in MnPt₅P

et al. 2020

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Subtle changes in chemical bonds may result in dramatic revolutions in magnetic properties in solid state materials. MnPt5P, a new derivative of the rare-earth-free ferromagnetic MnPt5As, was discovered and is presented in this work. MnPt5P was synthesized and its crystal structure and chemical composition were characterized by X-ray diffraction as well as energy-dispersive X-ray spectroscopy. Accordingly, MnPt5P crystallizes in the layered tetragonal structure with the space group P4/mmm (No. 123), in which the face-shared Mn@Pt12 polyhedral layers are separated by P layers. In contrast to the ferromagnetism observed in MnPt5As, the magnetic properties measurements on MnPt5P show antiferromagnetic ordering occurs at ~188 K with a strong magnetic anisotropy in and out of the ab-plane. Moreover, a spin-flop transition appears when a high magnetic field is applied. An A-type antiferromagnetic structure was obtained from the analysis of powder neutron diffraction (PND) patterns collected at 150 K and 9 K. Calculated electronic structures imply that hybridization of Mn-3d and Pt-5d orbitals are critical for both the structural stability and observed magnetic properties. Semi-empirical molecular orbitals calculations on both MnPt5P and MnPt5As indicate that the lack of 4p character on the P atoms at the highest occupied molecular orbital (HOMO) in MnPt5P may cause the different magnetic behavior in MnPt5P compared to MnPt5As. The discovery of MnPt5P, along with our previously reported MnPt5As, parametrizes the end points of a tunable system to study the chemical bonding which tunes the magnetic ordering from ferromagnetism to antiferromagnetism with strong spinorbit coupling (SOC) effect. † Certain commercial equipment, instruments, or materials are identified in this document. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the products identified are necessarily the best available for the purpose.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chemical Bonding Governs Complex Magnetism in MnPt₅P

et al. 2020

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“…A system has been proposed to reduce the magnetic field inside the vehicles of Superconducting Maglev Train by shielding measures [8]. Grain Oriented silicon steel (GO) has a high saturated magnetic flux density and also higher permeability than pure iron.…”

Section: __________________________________________________mentioning

confidence: 99%

Electromagnetic fields related to high speed transportation systems

Kircher¹,

Klühspies²,

Pałka

et al. 2018

Transportation Systems and Technology

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Issue: The potential health risks on passengers and the environment related to electromagnetic fields caused by the operation of electrically driven high speed transportation systems has become a major issue. Especially the magnetic flux density or induction can generate physiological effects in body tissues. Aim: In this paper, we compare calculated and experimental values of electromagnetic fields in rail-wheel systems such as ICE with the Maglev-systems Transrapid and the JR Maglev-system, based on available data. Method: To estimate the impact on passengers, the field contributions generated by the power supply system as well as by the drive and suspension systems are taken into account. For the comparison, the peak values of the electromagnetic fields have been considered. Results: The results show, that there are no health risks from the electric fields. Regarding the magnetic induction, the calculated the peak values remain well below the limits given by national regulations. In the case of the Transrapid and the JR Maglev system, the measured peak values in the environment and inside the vehicle depend on the levitation and the guidance technology and the geometrical parameters. The JR Maglev system requires effective magnetic shielding measures which are connected with heavy materials. Since such materials may have a negative influence on the energy balance and the economics of operation, R&D efforts are focusing on the optimization of materials and the structure of shields. Conclusion: In high speed transportation systems there are no potential risks from electrical fields. Regarding magnetic fields, the induction generated by the power supply and the drive system remain well below the frequency dependent limits. The situation is different for magnetic levitation systems, depending on the suspension and guidance technology. Especially the JR Maglev requires effective shielding measures. The shielding materials may have a negative impact on the energy balance.

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“…Furthermore, the EDS system is very applicable to the high‐speed operating state owing to its load disturbance rejection. However, there are some key issues unsolved, such as the heating problem caused by high induced current, which limits the engineering application of the EDS system [10, 11].…”

Section: Introductionmentioning

confidence: 99%

Adaptive robust constrained state control for non‐linear maglev vehicle with guaranteed bounded airgap

Chen

et al. 2018

IET Control Theory & Applications

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Reduction of magnetic field in vehicle of superconducting maglev train

Cited by 19 publications

References 1 publication

Chemical Bonding Governs Complex Magnetism in MnPt₅P

Chemical Bonding Governs Complex Magnetism in MnPt₅P

Electromagnetic fields related to high speed transportation systems

Adaptive robust constrained state control for non‐linear maglev vehicle with guaranteed bounded airgap

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Reduction of magnetic field in vehicle of superconducting maglev train

Cited by 19 publications

References 1 publication

Chemical Bonding Governs Complex Magnetism in MnPt5P

Chemical Bonding Governs Complex Magnetism in MnPt5P

Electromagnetic fields related to high speed transportation systems

Adaptive robust constrained state control for non‐linear maglev vehicle with guaranteed bounded airgap

Contact Info

Product

Resources

About

Chemical Bonding Governs Complex Magnetism in MnPt₅P

Chemical Bonding Governs Complex Magnetism in MnPt₅P