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Magnetic entropy dynamics in ultrafast demagnetization
Journal of Physics: Condensed Matter, 2020Abstract A double polarization and temperature modulation configuration was applied to measure the magnetization and magnetic entropy dynamics in ultrafast demagnetization. Two magnetic properties, obtained by subtracting measurements made at opposite fields, have the same onset at small delays and different relaxations at large ...
S Goharshenasanesfahani, S Smadici
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Feedback Effect during Ultrafast Demagnetization Dynamics in Ferromagnets
Physical Review Letters, 2013Motivated by the recent controversy about the importance of spin-flip scattering for ultrafast demagnetization in ferromagnets, we study the spin-dependent electron dynamics based on a dynamical Elliott-Yafet mechanism. The key improvement to earlier approaches is the use of a modified Stoner model with a dynamic exchange splitting between majority and
B Y, Mueller +6 more
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Dynamic Loading Impact-Induced Demagnetization in Thin Film Media
IEEE Transactions on Magnetics, 1993In order to eliminate the contact stress and deformation at the instant of head-disk impact during dynamic loading, the Hertz's impact theory is implemented in the dynamic loading numerical simulator. On the basis of the calculated stress field, inverse magnetostriction effects in longitudinal recording thin film media are considered and ...
D B Bogy
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Dynamic Characteristic Analysis of Irreversible Demagnetization in SPM- and IPM- Type BLDC Motors
IEEE Transactions on Industry Applications, 2015In this study, we developed an algorithm for the dynamic characteristic analysis of irreversible demagnetization. The conventional static characteristic analysis of irreversible demagnetization considers only d-axis magnetic flux components. However, the accuracy of this method is limited in its analysis of irreversible demagnetization characteristics ...
Jin Hur, Hyung-Kyu Kim
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Ultrafast Demagnetization Dynamics Excited by Near-Infrared to Mid-Infrared Pulses
The International Conference on Ultrafast Phenomena (UP) 2022, 2022Ultrafast demagnetization is investigated for different excitation wavelengths in the near- and mid-infrared spectral regions. While the initial drop in magnetization remains unchanged, the recovery dynamics are found to be wavelength dependent.
Katherine Légaré +3 more
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Dynamics of magnetization, reversal, and ultrafast demagnetization of TbFeCo amorphous films
Applied Physics Letters, 2008Static and dynamic hysteresis loops of TbFeCo amorphous films are measured by vibrating sample magnetometry (VSM) and magneto-optical Kerr rotation. The static VSM loop shows a faster magnetization reversal than the static Kerr loop does. The dynamic Kerr hysteresis loop in a sinusoidal alternating magnetic field at 1.14kHz shows a large increase in ...
Xiaodong Liu +8 more
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Demagnetizing field computation for dynamic simulation of the magnetization reversal process
IEEE Transactions on Magnetics, 1988The magnetic-field distribution for a thin magnetic film is computed using the fast Fourier transform technique. The method is quite general and accommodates any two-dimensional magnetization distribution. It allows the computation of fields both inside the film (demagnetizing fields) and outside (stray fields and leakage). >
M. Mansuripur, R. Giles
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Evidence of Ferromagnetism and Ultrafast Dynamics of Demagnetization in an Epitaxial FeCl2 Monolayer
ACS NanoThe development of two-dimensional (2D) magnetism is driven not only by the interest of low-dimensional physics but also by potential applications in high-density miniaturized spintronic devices. However, 2D materials possessing a ferromagnetic order with a relatively high Curie temperature (Tc) are rare.
Xuhan Zhou +6 more
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Magnetic properties of heat-treated steels after dynamic and static demagnetization
Russian Journal of Nondestructive Testing, 2008The influence of demagnetization methods on the character of the initial magnetization curves of hardened and tempered steel U8A has been studied. It has been established that the structural sensitivity of hysteresis properties of steels U8A and 60C2A changes with changes in the amplitude values of both magnetization-reversing fields and induction ...
V. N. Kostin +2 more
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Ultrafast optical demagnetization dynamics in thin elemental films and alloys
2019Diese Doktorarbeit untersucht die photoinduzierte Femtosekunden Magnetisierungsdynamik in den grundlegenden Übergangsmetallen (TMs) Fe, Co und Ni sowie in der technologisch relevanten CoPt Legierung mittels magnetischem zirkular Dichroismus (MCD). In diesem Zusammenhang wurde eine laborbasierte Lichtquelle für die Erzeugung höherer Harmonischer (HHG ...
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