65 research outputs found
Influence of diffusion of Fe atoms into the emissive layer of an organic light-emitting device on the luminescence properties
INSTABILITY OF PERMEABILITY OF AN AMORPHOUS Fe_5Co_<70>Si_<15>B_<10> ALLOY
Exciting field (0~250 mOe) and temperature (-196~420℃) dependences of permeability and disaccommodation have been studied for a rapidly quenched amorphous Fe_5Co_Si_B_ alloy by using an automatic measuring apparatus of disaccommodation. Disaccommodation takes a broad maximum of about 6% at around room temperature and also a broad and large maximum, 10~30%, at about 190℃ after cooling from 420℃, which is below the crystallization temperature. The former and later maximum points correspond roughly to the Curie points of Co_2B and (Fe-Co)_2 B alloys, respectively, which are the constitutional alloys of a crystallized Fe_5Co_Si_B_ alloy
Magnetic and transport properties of tetragonal- or cubic-Heusler-type Co-substituted Mn-Ga epitaxial thin films
The composition dependence of the structural, magnetic, and transport
properties of epitaxially grown Mn-Co-Ga films were investigated. The crystal
structure was observed to change from tetragonal to cubic as the Co content was
increased. In terms of the dependence of saturation magnetization on the Co
content, relatively small value was obtained for the
MnCoGa film at a large {\it K} value of 9.2
Merg/cm. Electrical resistivity of Mn-Co-Ga films was larger than that of
pure Mn-Ga film. The maximum value of the resistivity was 490 cm for
MnCoGa film. The high resistivity of Mn-Co-Ga might be
due to the presence of localized electron states in the films due to chemical
disordering caused by the Co substitution.Comment: 3 pages, 5 figures. The article has been submitted to the Journal of
Applied Physics as a Proceedings for the 12th Joint MMM/INTERMAG conferenc
Reduction of switching fields of submicrometer sized magnetic tunnel junction with NiFe-based synthetic ferrimagnetic free layer
Spin transfer switching in the nanosecond regime for CoFeB/MgO/CoFeB ferromagnetic tunnel junctions
Bias-voltage dependence of magnetoresistance in magnetic tunnel junctions grown on Al2O3 (0001) substrates
Perpendicularly magnetized Mn-Co-Ga-based thin films with high coercive field
MnCoGa epitaxial thin films were grown on MgO substrates by
magnetron co-sputtering. Structures were tetragonal or cubic depending on Co
content. Composition dependence of saturation magnetization and uniaxial
magnetic anisotropy of the films were investigated. A high (1.2 MJ
m) was achieved for the MnCoGa film with the
magnetic moment 0.84. Valence band spectra were obtained by hard X-ray
photoelectron spectroscopy. Sharp peaks in the cubic case, which were absent in
the tetragonal case, prove that a van Hove singularity causes a band
Jahn-Teller effect with tetragonal distortion. Observations agree well with the
first-principles calculations
Fabrication of high-magnetoresistance tunnel junctions using Co75Fe25 ferromagnetic electrodes
科研費報告書収録論文(課題番号:11355001・基盤研究(A)(2)・H11~H13/研究代表者:宮崎, 照宣/ハイブリッド磁性体の微細化プロセスとトンネル再生磁気ヘッドの作製
Tunneling magnetoresistance of magnetic tunnel junctions using perpendicular magnetization L10-CoPt electrodes
Electron transport properties in magnetic tunnel junctions with epitaxial NiFe (111) ferromagnetic bottom electrodes
科研費報告書収録論文(課題番号:13305001・基盤研究(A)(2) ・H13~H15/研究代表者:宮崎, 照宣/高品位微小トンネル接合へのスピン注入
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