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Fabrication and Magnetic Properties of MnFe2O4 Nanowire Arrays
Leszek Malkinski,Jin Hee Lim,Weon Sik Chae,Hee Ok Lee,Eun Mee Kim,Jin Seung Jung 대한금속재료학회 ( 구 대한금속학회 ) 2009 ELECTRONIC MATERIALS LETTERS Vol.5 No.2
One of the most important magnetic materials, ferrite nanoparticles, has extensively been studied because of their potential applications in magnetic storage media and magnetic resonance imaging (MRI). The magnetic properties of these nanoparticles can significantly change depending on their shape. 8 nm manganese ferrite nanoparticles were synthesized by thermal decomposing the metal complex and surfactant. The process of embedding MnFe2O4 nanoparticles into the pores of the anodic aluminum oxide (AAO) was assisted by the magnetic field of the permanent magnet that was placed directly under the substrate in the vacuum. The nanowires formed in the pores from the ferrite nanoparticles were annealed at 400℃ and 600℃ in an Ar gas atmosphere in order for the morphology to transform. The morphology of the manganese ferrite nanoparticles before and after annealing was observed using a field-emission scanning electron microscope. The coercivity and squareness of the hysteresis loop of the annealed ferrite that resulted from the morphological changes increased when the annealing temperature increased.
Fabrication and Magnetic Properties of Co Nanostructures in AAO Membranes
Jung, J.S.,Malkinski, L.,Lim, J.H.,Yu, M.,O'Connor, C.J.,Lee, H.O.,Kim, E.M. Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.4
Nanoporous AAO (Anodic Aluminum Oxide) membranes have many advantages as a template for variety of magnetic materials. Materials can be embedded into the pores by electrodeposition, sputtering or magnetic-field-assisted infiltration of magnetic nanoparticles. This work focuses on the fabrication of the magnetic structures in the AAO templates by electrodeposition. Our method allows the controlled growth of Co nanostructures within the porous alumina membrane in the form of dots, rods and long wires. The shape of Co nanostructures has been investigated by field emission scanning electron microscope (FESEM). The magnetic hysteresis loops of Co nanostructures were measured using SQUID at 5 K and 300 K. The magnetic properties of the Co nanostructures are proportional to their aspect ratios and can be controlled by changing the aspect ratios.
Fabrication and Magnetic Properties of Co Nanostructures in AAO Membranes
J.-S. Jung*,L. Malkinski,J.-H. Lim,M. Yu,C. J. O’Connor,H.-O. Lee,E.-M Kim 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.4
Nanoporous AAO (Anodic Aluminum Oxide) membranes have many advantages as a template for variety of magnetic materials. Materials can be embedded into the pores by electrodeposition, sputtering or magnetic-field-assisted infiltration of magnetic nanoparticles. This work focuses on the fabrication of the magnetic structures in the AAO templates by electrodeposition. Our method allows the controlled growth of Co nanostructures within the porous alumina membrane in the form of dots, rods and long wires. The shape of Co nanostructures has been investigated by field emission scanning electron microscope (FESEM). The magnetic hysteresis loops of Co nanostructures were measured using SQUID at 5 K and 300 K. The magnetic properties of the Co nanostructures are proportional to their aspect ratios and can be controlled by changing the aspect ratios.
Magnetic entropy change of V substituted Ni-Mn-Ga Heusler alloy
Min, S. G.,Zhang, Y. D.,Malkinski, L.,Yu, S. C.,Lee, K. W.,Kim, Y. C. American Institute of Physics 2009 JOURNAL OF APPLIED PHYSICS - Vol.105 No.7
<P>The magnetization behaviors have been analyzed for Ni54Mn21-xVxGa25 (x=0,2,4) alloys which were prepared by conventional arc melting method in argon atmosphere. The Curie temperature T-C was found to be 325, 300, and 265 K and the austenitic transition temperature T-A on heating was found to be 315, 217, and 124 K for x=0, 2, and 4, respectively. The magnetic characteristics were performed with a Quantum Design superconducting quantum interference device magnetometer in the field of up to 20 kOe. A large magnetic entropy change Delta S-M, which is calculated from H versus M curves associated with the ferromagnetic-paramagnetic transitions, has been observed. The maximum Delta S-M for an applied field of 2.0 T is 2.49, 1.92, and 1.81 J/kg K for x= 0, 2, and 4, respectively. (c) 2009 American Institute of Physics. [DOI: 10.1063/1.3072819]</P>
Electrodeposited Nickel Nanodots Array on the Silicon Wafer
정진승,Eun-Mee Kim,Weon-Sik Chae,Leszek M. Malkinski,Charles O’Connor,Jin-Hee Lim,Jong-Ho Jun 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.11
Nanoporous anodic aluminum oxide (AAO) membrane has many advantages as a host material for a variety of magnetic materials. The magnetic materials can be embedded into the host pores by electrodeposition, sputtering, and infiltration routes. This work shows that the entire fabrication process to the magnetic nanomaterial through the AAO templating method can be thoroughly integrated with silicon technology. Thin aluminum film is directly deposited on the titanium precoated silicon wafer by dc sputtering. Subsequent twostep anodization of the aluminum film results in uniform morphology of the long-range ordered array of cylindrical alumina nanopores, which is used as a template for the electrochemical growth of the Ni nanodots array. The observed magnetic hysteresis loops at 10 K and room temperature show unique ferromagnetic coupling for the Ni nanodot array depending on field directions.