@article{SisLab3398,
          volume = {8},
           month = {March},
          author = {Duy Truong Quach and Duc Thang Pham and Duc The Ngo and The Long Phan and Seung-Young Park and Sang-Hyuk Lee and Dong-Hyun Kim},
           title = {Minor hysteresis patterns with a rounded/sharpened reversing behavior in ferromagnetic multilayer},
       publisher = {Nature Publishing Group},
         journal = {Scientific Reports},
           pages = {4461},
            year = {2018},
             url = {https://eprints.uet.vnu.edu.vn/eprints/id/eprint/3398/},
        abstract = {Hysteresis of ferromagnetic system exhibits a fundamental stimulus-response behavior, thereby
casting all the important macromagnetic system parameters such as coercivity, nucleation feld,
saturation magnetization, and hysteresis loss. Recently, increasing attention has been paid to
exploration of relatively less understood minor loop behavior, since faster operation of magnetic
devices is inevitably accompanied by minor hysteresis behavior from cycling among unsaturated
ferromagnetic states. Here, we report our microscopic investigation of unusual minor hysteresis loop
behavior, represented by rounded or sharpened response of minor hysteresis loop of (CoFeB/Pd)4
multilayer flm. It is observed that rounded and sharpened response in the minor hysteresis response
could be manifested under proper conditions. The minor loop behavior has been systematically
investigated by direct microscopic magnetic domain observation using magneto-optical Kerr
microscopy. The rounded response of magnetization at the reversing external feld along the minor
hysteresis curve, so far neglected or considered as one of ?unusual? behaviors, has been found to be
elaborately controllable by tuning the reversing feld strength and the feld sweep rate for multilayers
with low repeat numbers. Variable roundedness of the minor hysteresis loop is understandable based on
the analysis of magnetic domain dynamics such as domain nucleation and the domain wall velocity.}
}