1,721,090 research outputs found
Influence of gasification on the performance of a 1 MHz nozzle system in megasonic cleaning
No full textInfluence of gasification on electro-acoustical and cleaning performance of a 1 MHz nozzle system in megasonic cleaning
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Importance of bubble size control in ultrasonic surface cleaning by pulsed high-frequency soundfields
No full textManipulating the asymmetry of magnetization reversal in epitaxial CoO/Co films
No full text© 2014 American Physical Society. We investigated the training effect and magnetization reversal in CoO/Co bilayer films grown epitaxially on MgO (001) substrates. The asymmetry of the magnetization reversal, which appears due to the exchange bias after field cooling, survives after training, in contrast to the case of polycrystalline bilayers. By applying hysteresis loops with the magnetic field perpendicular to the cooling field, we are able to modify the orientation of the average uncompensated magnetization of the antiferromagnetic CoO. Subsequently, the untrained state can be partially restored, and more importantly the magnetization reversal asymmetry can be inverted by starting the perpendicular loop with the appropriate field polarity. Consequently, we succeeded in manipulating the magnetization reversal asymmetry and even in achieving opposite reversal asymmetries in the same exchange bias system.sponsorship: This work has been supported by the Research Foundation-Flanders (FWO, Belgium), as well as by the Flemish Concerted Research Action program (BOF KU Leuven, project GOA/14/007) and the Flemish Hercules Foundation (project AKUL 09/042). (Research Foundation-Flanders (FWO, Belgium), Flemish Concerted Research Action program (BOF KU Leuven)|GOA/14/007, Flemish Hercules Foundation|AKUL 09/042)status: Publishe
Interplay between magnetocrystalline anisotropy and exchange bias in epitaxial CoO/Co films
No full textThe interplay between magnetocrystalline anisotropy and exchange bias is investigated in CoO/Co bilayer films, which are grown epitaxially on MgO (0 0 1), by magnetization reversal measurements based on the anisotropic magnetoresistance (AMR) effect. While an asymmetric magnetization reversal survives after training for cooling field (CF) along the hard axis, the magnetization reversal becomes symmetric and is dominated in both branches of the hysteresis loop by domain wall motion before and after training for CF along the easy axis. When performing an in-plane hysteresis loop perpendicular to the CF, the hysteresis loop along the easy axis becomes asymmetric: magnetization rotation dominates in the ascending branch, while there is a larger contribution of domain wall motion in the descending branch. Furthermore, the azimuthal angular dependence of the AMR shows two minima after performing a perpendicular hysteresis loop, instead of only one minimum after training. Relying on the extended Fulcomer and Charap model, these effects can be related to an increased deviation of the average uncompensated antiferromagnetic magnetization from the CF direction. This model provides a consistent interpretation of training and asymmetry of the magnetization reversal for epitaxial films with pronounced magnetocrystalline anisotropy as well as for the previously investigated polycrystalline films.sponsorship: This work has been supported by the Research Foundation-Flanders (FWO, Belgium) as well as by the Flemish Concerted Research Action program (BOF KU Leuven, project GOA/14/007) and the Flemish Hercules Foundation (project AKUL 09/042). The work at Shenzhen University was supported by National Natural Science Foundation of China under Grant No. 51502178 and Shenzhen Science and Technology Project under Grant No. JCYJ20150324141711644. (Research Foundation-Flanders (FWO, Belgium), Flemish Concerted Research Action program (BOF KU Leuven)|GOA/14/007, Flemish Hercules Foundation|AKUL 09/042, National Natural Science Foundation of China|51502178, Shenzhen Science and Technology Project|JCYJ20150324141711644)status: Publishe
Large-area graphene transfer through synthesis of an interfacial release layer between epitaxial Cu(Ni)(111) and Al2O3(0001) template
No full textInfluence of surface tension on cavitation noise spectra and particle removal efficiency in high frequency ultrasound fields
No full textTowards an improved megasonic cleaning process: influence of surface tension on bubble activity in acoustic fields
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