High-Sensitivity Magnetometer for Studying Magnetic Flux Capture in High-Temperature Superconductors

Rostami, Kh. R.

doi:10.1007/s11018-017-1132-4

Cited by 4 publications

(2 citation statements)

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“…This characteristic is valuable for utilization, such as developing magnetic sensors with higher responsivity and more sensitive magnetometers. [143][144][145][146] The nonlinear response characteristics of higher-order EP magnetic systems to external stimuli have been extensively studied through theoretical simulations. However, recent theoretical studies have shown that quantum fluctuations near EP can be significant.…”

Section: High Susceptibility Near Epmentioning

confidence: 99%

Parity‐Time Symmetry in Magnetic Materials and Devices

Zhang,

Xin,

Liu

2023

Adv Elect Materials

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Non‐Hermitian Hamiltonians may still possess real eigenvalues in case of the existence of parity‐time (PT) symmetry. Exceptional points (EPs) occur at the phase transition from real to complex eigenvalues due to PT‐symmetry breaking in the parameter space. Magnonic devices use magnons to carry, transport, and process information, which have the advantages of low energy dissipation, wave‐based computing, and nonlinear data processing. The combination of PT‐symmetry and magnonics may lead to novel physics as well as unprecedented functional device applications. Recently, the research of PT‐symmetry in magnetism has developed rapidly. In this review, the theoretical predictions as well as experimental findings of PT‐symmetry in magnetism are summarized. First, a brief introduction to PT symmetry, EPs, and anti‐PT symmetry is presented. Second, the theoretical and experimental progress of magnonic PT symmetry are summarized. Third, the theoretical predictions of higher‐order EPs and anti‐PT symmetry in magnonic systems are given. Finally, the study concludes by discussing the future challenges and research prospects in magnonic PT‐symmetry, and proposals for experimental observations of magnonic higher‐order EPs and anti‐PT symmetry are suggested.

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Section: High Susceptibility Near Epmentioning

confidence: 99%

Parity‐Time Symmetry in Magnetic Materials and Devices

Zhang,

Xin,

Liu

2023

Adv Elect Materials

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show abstract

“…The second copper wire was attached to the opposite side of HT 1 and was fed by a separate controlled current source. The setup allowed us to detect HT signals with accuracy of at least 2.5 × 10 -7 T and to move the HT from the center to the periphery of the sample along the z axis [7,8]. The magnetic field was directed perpendicular to the plane of the samples.…”

Section: Details Of Experimentsmentioning

confidence: 99%

Local internal demagnetizing fields as one of the main fundamental reasons for the low density of critical current in twinned YBa₂Cu₃O_{7 − x} HTSCs

Rostami

2023

Supercond. Sci. Technol.

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An oscillatory differential method of local approximation is applied to study the effect of local internal and external demagnetizing fields on the density of the critical current Jc of intertwin Josephson weak links in YBCO HTSC samples. Demagnetizing fields HD1 and HD2 of samples with different Jc and twin size d are measured in the ZFC and ZFCMFA modes. The following parameters are determined: the twin size d, the thermodynamic first critical magnetic fields of twins Hic1, the demagnetizing fields of twins HDtr, the densities of intertwin effective critical currents Jceff, the critical pinning currents Jcp, and the Meissner screening critical currents Jcg. It is shown that, at the fields Hic1, large twins are stepwise decomposed into a group of smaller twins with close demagnetizing factors. It is found that an increase in Jcg and Jceff and a decrease in d lead, on the one hand, to a decrease in Jc due to an increase in HD and HDtr produced by Jceff and Jcg, on the other hand, to an increase in Jceff and Jcg due to a decrease in d. For samples with large Jc and d, as well as for samples with low values of Jc and d in a field of about 810-2 T, HD and HDtr suppress Jc by about 70% and 60%, respectively. According to the results obtained in the present study and the known literature data, Jc decreases with increasing Jcg; in this case, a decrease in d leads to a decrease, rather than an increase, in Jc. Since the weak links and low values of Jc are fundamental properties of HTSCs, the literature data should be corrected with regard to the important facts on the effect of HD and HDtr on Jc.

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High-sensitivity two-stage Hall magnetometer with enhanced linearity and spatial resolution

Rostami

Nikitin

2020

Measurement

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High-Sensitivity Magnetometer for Studying Magnetic Flux Capture in High-Temperature Superconductors

Cited by 4 publications

References 1 publication

Parity‐Time Symmetry in Magnetic Materials and Devices

Parity‐Time Symmetry in Magnetic Materials and Devices

Local internal demagnetizing fields as one of the main fundamental reasons for the low density of critical current in twinned YBa₂Cu₃O_{7 − x} HTSCs

High-sensitivity two-stage Hall magnetometer with enhanced linearity and spatial resolution

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High-Sensitivity Magnetometer for Studying Magnetic Flux Capture in High-Temperature Superconductors

Cited by 4 publications

References 1 publication

Parity‐Time Symmetry in Magnetic Materials and Devices

Parity‐Time Symmetry in Magnetic Materials and Devices

Local internal demagnetizing fields as one of the main fundamental reasons for the low density of critical current in twinned YBa2Cu3O7 − x HTSCs

High-sensitivity two-stage Hall magnetometer with enhanced linearity and spatial resolution

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Local internal demagnetizing fields as one of the main fundamental reasons for the low density of critical current in twinned YBa₂Cu₃O_{7 − x} HTSCs