Influence of High Energy Heavy Ions on Magnetic Susceptibility of Soft Magnetic Metallic Glasses

Pavlovič, Márius; Miglierini, Marcel; Мустафин, Е. С.; Seidl, Tim; Šoka, Martin; Ensinger, Wolfgang

doi:10.12693/aphyspola.126.54

Cited by 5 publications

(8 citation statements)

References 10 publications

(8 reference statements)

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“…Its final value of 0.32% is more than twice as high as the value at the fluence of 2 Â 10 12 ions cm À2 (0.15%). It should be noted that a similar effect of a sudden change was observed for the magnetic susceptibility in the A alloy irradiated with the fluence of 2 Â 10 12 ions cm À2 [10,11,36]. Based on the magnetic susceptibility measurements, it was found that the A alloy is magnetically stable up to the fluence of 2 Â 10 12 ions cm À2 .…”

Section: Structural Relaxation During the Full Heating-cooling Cyclementioning

confidence: 52%

“…One can speculate if saturation could occur at sufficiently high fluencies (higher than 10 13 ions cm À2 ). Such a saturation tendency has been observed in magnetic susceptibility measurements [36]. However, it is noteworthy that the available fluencies are limited by the performance of the irradiation facility.…”

Section: Structural Relaxation During the Full Heating-cooling Cyclementioning

confidence: 56%

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Structural modifications of swift-ion-bombarded metallic glasses studied by high-energy X-ray synchrotron radiation

et al. 2014

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Section: Structural Relaxation During the Full Heating-cooling Cyclementioning

confidence: 52%

Section: Structural Relaxation During the Full Heating-cooling Cyclementioning

confidence: 56%

Structural modifications of swift-ion-bombarded metallic glasses studied by high-energy X-ray synchrotron radiation

et al. 2014

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“…Details of these experiments have been reported in (10,11). It is evident that VITROPERM ® is radiation harder against heavy ions than VITROVAC ® (direct comparison is possible especially via the data for Au ions at 11.1 MeV/A).…”

Section: Resultsmentioning

confidence: 99%

Radiation damage studies of soft magnetic metallic glasses irradiated with high-energy heavy ions

Pavlovič

Miglierini

Мустафин

et al. 2015

Radiation Effects and Defects in Solids

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Some soft magnetic metallic glasses are considered for use in magnetic cores of accelerator radio frequency cavities. Due to losses of the circulating ion beam, they may be exposed to irradiation by different ions at different energies. This paper presents data and review results of irradiation experiments concerning the influence of high-energy heavy ions on magnetic susceptibility of VITROPERM ® -type metallic glasses. Samples of the VITROPERM ® magnetic ribbons were irradiated by Au, Xe and U ions at 11.1 MeV/A (per nucleon) and 5.9 MeV/A, respectively. Irradiation fluences from 1 × 10 11 up to 1 × 10 13 ions/cm 2 were applied. In case of the Au and U ions, the total fluence was accumulated in one beamtime, whereas two separate beamtimes were used to accumulate the final fluence in case of the Xe ions. Relative change in the samples' magnetic susceptibility after and before irradiation was evaluated as a function of the irradiation fluence. The irradiation experiments were performed with the UNILAC accelerator at GSI Helmholtzzentrum für Schwerionenforschung GmbH. They were simulated in SRIM2010 in order to obtain ionization densities (electronic stopping, dE/dx) and dpa (displacements per atom) caused by the ion beams in the sample material. This paper focuses mainly on the results collected in experiments with the Xe ions and compares them with data obtained in earlier experiments using Au and U ions. Radiation hardness of VITROPERM ® is compared with radiation hardness of VITROVAC ® that was studied in previous experiments. The VITROPERM ® samples showed less drop in magnetic susceptibility in comparison with the VITROVAC ® ones, and this drop occurred at higher fluences. This indicates higher radiation hardness of VITROPERM ® compared with VITROVAC ® . In addition, heavier ions cause bigger change in magnetic susceptibility than the lighter ones. The effect can be roughly scaled with electronic stopping, which suggests that the main mechanism of radiation damage is associated with swift electrons generated in the material via ionization by primary heavy ions.

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“…The first group of materials could be so-called metallic glasses, especially the softmagnetic metallic alloys. They also feature similar chemical composition [15,16] and the ion-range data are needed for radiation hardness studies of these materials against ion irradiation [17][18][19][20][21]. The second possible candidates could be steels; a large family of materials made of the same iron bulk material with different additive elements and processed by different technological treatments.…”

Section: Discussionmentioning

confidence: 99%

Ranges of protons in biological targets

Pavlovič

Hammerle

2017

Journal of Electrical Engineering

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The paper introduces a simple fitting function for quick assessment of proton ranges in biological targets and human tissues. The function has been found by fitting an extensive data set of Monte Carlo proton ranges obtained with the aid of the SRIM-2013 code. The data has been collected for 28 different targets at 8 energies in the interval from 60 MeV to 220 MeV. The paper shows that at a given kinetic proton-beam energy, the Monte Carlo ranges can be satisfactorily fitted by a power function that depends solely on the target density. This is a great advantage for targets, for which the exact chemical composition is not known, or the mean ionizing potential is not reliably known. The satisfactory fit is meant as the fit that stays within the natural range straggling of the Monte Carlo ranges. In the second step, the energy-scaling yielding a universal fitting formula for proton ranges as a function of proton-beam energy and target density is introduced and discussed. This paper is an extended version of the contribution presented at the APCOM2017 conference.K e y w o r d s: biological targets, proton range, proton therapy, range straggling, SRIM

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Influence of High Energy Heavy Ions on Magnetic Susceptibility of Soft Magnetic Metallic Glasses

Cited by 5 publications

References 10 publications

Structural modifications of swift-ion-bombarded metallic glasses studied by high-energy X-ray synchrotron radiation

Structural modifications of swift-ion-bombarded metallic glasses studied by high-energy X-ray synchrotron radiation

Radiation damage studies of soft magnetic metallic glasses irradiated with high-energy heavy ions

Ranges of protons in biological targets

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