Monte Carlo study of radiation-induced demagnetization using the two-dimensional Ising model

Samin, Adib J.; Cao, Lei

doi:10.1016/j.nimb.2015.08.067

Cited by 4 publications

(3 citation statements)

References 29 publications

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“…As discussed in previous studies16171819, bombardment of a high-energy electron induces thermal spikes along its path, which leads to localized temperature rise in a specific region in the PM. If the resultant temperature goes beyond the Curie point, the permanent magnetism is completely lost around this region.…”

Section: Resultsmentioning

confidence: 82%

Radiation-induced magnetization reversal causing a large flux loss in undulator permanent magnets

Bizen

Kinjo

Hasegawa

et al. 2016

Sci Rep

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We report an unexpectedly large flux loss observed in permanent magnets in one of the undulators operated in SACLA, the x-ray free electron laser facility in Japan. Characterizations of individual magnets extracted from the relevant undulator have revealed that the flux loss was caused by a homogeneous magnetization reversal extending over a wide area, but not by demagnetization of individual magnets damaged by radiation. We show that the estimated flux-loss rate is much higher than what is reported in previous papers, and its distribution is much more localized to the upstream side. Results of numerical and experimental studies carried out to validate the magnetization reversal and quantify the flux loss are presented, together with possible countermeasures against rapid degradation of the undulator performance.

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Section: Resultsmentioning

confidence: 82%

Radiation-induced magnetization reversal causing a large flux loss in undulator permanent magnets

Bizen

Kinjo

Hasegawa

et al. 2016

Sci Rep

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“…After the calculation of opto-magnetic and opto-thermal effects of the laser, we simulate the magnetization switching by the Monte Carlo method. − ,, More information can be found in the Supporting Information. Figure a shows the magnetization switching for configuration (σ + , M – ), which means the input light is right-handed circularly polarized and the initial magnetization points downward.…”

Section: Methods and Resultsmentioning

confidence: 99%

“…However, direct modeling of magnetization switching induced by the localized chiral field is still lacking. One effective model that can analyze magnetization switching with external laser pulses is the Monte Carlo method, which has been utilized to simulate the heat-assistant magnetization reversal in ultrathin films, 60 radiation-induced demagnetization, 61 and all-optical switching. 62 In the model of all-optical switching, the opto-thermal and opto-magnetic effects of lasers are considered.…”

Section: Introductionmentioning

confidence: 99%

Multiphysics Modeling of Plasmon-Enhanced All-Optical Helicity-Dependent Switching

Cheng

Wang

et al. 2023

ACS Photonics

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In this work, we propose a multiphysics approach to simulate all-optical helicity-dependent switching induced by the local hot spots of plasmonic nanostructures. Due to the plasmonic resonance of an array of gold nanodisks, strong electromagnetic fields are generated within the magnetic recording media underneath the gold nanodisks. We construct a multiphysics framework considering the opto-magnetic and opto-thermal effects, and then model the magnetization switching using the Monte Carlo method. Our approach bridges the gap between plasmonic nanostructure design and magnetization switching modeling, allowing for the simulation of helicity-dependent, nanoscale magnetization switching in the presence of localized surface plasmons.

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Irradiation caused performance losses of undulators equipped with Sm2Co17 magnets

Heidrich¹,

Aulenbacher²,

Donders

et al. 2018

Journal of Magnetism and Magnetic Materials

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Monte Carlo study of radiation-induced demagnetization using the two-dimensional Ising model

Cited by 4 publications

References 29 publications

Radiation-induced magnetization reversal causing a large flux loss in undulator permanent magnets

Radiation-induced magnetization reversal causing a large flux loss in undulator permanent magnets

Multiphysics Modeling of Plasmon-Enhanced All-Optical Helicity-Dependent Switching

Irradiation caused performance losses of undulators equipped with Sm2Co17 magnets

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