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Samardak, Alexander S.,Davydenko, Alexander V.,Ognev, Alexey V.,Jeon, Yoo Sang,Choi, Young Soo,Kim, Young Keun IOP Publishing 2016 Japanese journal of applied physics Vol.55 No.10
<P>Understanding the ferromagnetic behavior of coupled magnetic nanoparticles (NPs) in a chain structure, called a 'nanochain (NC)', will open up new routes for its practical use. Here, we report the magnetization reversal modes in isolated magnetite (Fe3O4) NPs with diameters of 100 and 200 nm, as well as those of one-dimensional (1D) self-assembled NCs consisting of these NPs. NCs consisting of 100-nm diameter NPs switched through a transverse domain wall-like motion. Meanwhile, in 200-nm diameter NPs and NCs, we observed 3D magnetic vortex states that were more energetically favorable than single domain or multidomain states. (C) 2016 The Japan Society of Applied Physics</P>
Magnetization reversal of ferromagnetic nanosprings affected by helical shape
Nam, Da Yeon,Samardak, Aleksei Yu.,Jeon, Yoo Sang,Kim, Su Hyo,Davydenko, Alexander V.,Ognev, Alexey V.,Samardak, Alexander S.,Kim, Young Keun The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.43
<P>Helicity, a natural property of macro-, micro-, and nano-objects, potentially offers a new dimension to mechanical and electromagnetic applications for creating emerging nanodevices, such as nanorobots, nanomagnets, nanosensors, and high-density magnetic memory. Helical magnetic nanosprings are unique objects with remarkable magnetic properties, including the absence of stray fields in remanence owing to the chiral geometry, which makes them promising for data storage devices, nanoelectromechanical systems, and biomedical usage. Here, we investigated Co and CoFe nanospring arrays electrodeposited in highly ordered nanoporous templates. We report helical-shape-driven magnetization reversal of the nanosprings in comparison with the behavior of dipolarly coupled nanowires. We reveal two magnetization reversal modes depending on the orientation of the external magnetic field: coherent rotation of magnetization in the longitudinal geometry and three-dimensional vortex domain wall motion in the transverse geometry. The experimental findings are supported by analytical calculations and micromagnetic simulations that help to explain the field-dependent spin configurations observed by magnetic force microscopy.</P>
3-Dimensional Magnetostatic Interactions in Controllable Magnetic Fe/Au Barcode Nanowire Arrays
Eunjin Jeong,Aleksei Yu. Samardak,Yoo Sang Jeon,Vadim Yu. Samardak,Aleksei G. Kozlov,Kirill A. Rogachev,Alexey V. Ognev,Gyu Won Kim,Min Jun Ko,Alexander S. Samardak,Young Keun Kim 한국자기학회 2022 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2