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Structure Analysis and Local Magnetic Parameters of Magnetoresistance Tunnel Junctions
Cheol Gi Kim1, Chong-Oh Kim,1, Yongkang Hua1, J. Kanak2, T. Stobiecki,2, S. Ogata,3, M. Tsunoda3 and M. Takahashi3
1Department of Materials Engineering, Chungnam National University, Taejon, Korea
2
Department of Electronics, University of Mining and Metallurgy, Krakow, Poland
3Department of Electronic Engineering, Tohoku University, Sendai, Japan
Abstract
The Magnetoresistance Tunnel Junctions (MTJ) were deposited by DC magnetron sputtering method in the following layer sequence: Ta(50Å)/Cu(100Å)/Ta(50Å)/Ni80Fe20(20Å)/Cu(50Å)/Mn75Ir25(100Å)/Co70Fe30(25Å)/Al-O/Co70Fe30(25Å)/Ni80Fe20(t) /Ta(50Å)/, with t = 0Å, 100Å and 1000Å. X-ray diffraction analysis revealed that highly oriented fcc-(111) of IrMn3, Cu, Ni80Fe20 and Co70Fe30 crystal planes are stacked parallel to the substrate plane. The improvement of (111) texture and crystallinity was observed after annealing. The tunneling magnetoresistance ratio of patterned junction with electrode layer of Ni80Fe20 (t = 1000Å), deposited on the free layer of Co70Fe30 (25Å) exceeds 40% at room temperature after annealing at 200°C in magnetic field 1kOe. The local hysteresis loops were measured using the magneto-optical Kerr effect system. The relatively irregular variations of coercive force Hc and unidirectional anisotropy field Hua in as-deposited sample are revealed. After 200°C annealing Hc decreases but Hua increases with smooth local variations. Two-dimensional plots of Hc and Hua show the symmetric saddle shapes with their axes aligned with the pinned layer. The distribution of surface roughness is symmetric with respect to the center of MTJ. Correlation between surface roughness and the variation of Hua suggests that the Hua variation of the free layer is well described by dipole interactions in the form of socalled Néel "orange peel" coupling.
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Download article (PDF)Magnetic Properties of Fe/Si and Co/Si Multilayers
T. Luciński1, M. Kopcewicz2, A. Hütten3, H. Brückl3, S. Heitmann3, T. Hempel3 and G. Reiss3
1Institute of Molecular Physics, Polish Academy of Sciences, Poznań, Poland
2Institute of Electronic Materials Technology, Warsaw, Poland
3Faculty of Physics, University of Bielefeld, Bielefeld, Germany
Rotational Anisotropy in Exchange-biased NiFe/FeMn Bilayers
Do-Guwn Hwang
Department of Computer and Electronic Physics, Sangji University, Korea
Exchange Coupling Field in Top, Bottom, and Dual Type IrMn Spin Valves Coupled to CoFe
J. Y. Hwang and J. R. Rhee
Department of Physics, Sookmyung Women's University, Korea
The Effect of Underlayers on Grain Orientation and Magnetic Properties of Barium-ferrite Thin Film
Dong Hyoun Kim1, In Tak Nam1, Yang Ki Hong2
1Kangwon National University, Chunchon, Korea
2University of Idaho, Moscow, USA
Effective Magnetostriction in Nanocrystalline Alloys
A. Ślawska-Waniewska
Institute of Physics, Polish Academy of Sciences, Warszawa, Poland
Micromagnetic Simulation of Multiphase Nanocrystalline Material with Different Boundary Conditions
O. Nedelko1, A. Ślawska-Waniewska1, Y. Labaye2
1Institute of Physics, Polish Academy of Sciences, Warsaw, Poland
2Laboratoire de Physique de l'Etat Condensé, Université du
Maine, Mans, France
Influence of In Dilution Level on Magnetic Mroperties and Photoconductivity of Cd1-yCr2-2xIn2x+ySe4 Magnetic Semiconductors
B.T. Cięciwa, L. J. Maksymowicz, M. Lubecka, H. Jankowski, J. Sokulski, Z. Sobków
Department of Electronics, University of Mining and Metallurgy, Kraków, Poland
Magnetic Properties of the RMn12-xTx Alloys in High Magnetic Field #
W. Suski1,2, B. Belan3, A. Gilewski1, T. Mydlarz1, K. Wochowski2
1International Laboraratory of High Magnetic Fields and Low Temperatures, Wrocław, Poland
2Polish Academy of Science, W.Trzebiatowski Institute of Low Temperature and Structure Research, Wrocław, Poland
3Department of Inorganic Chemistry, Ivan Franko National University of L'viv, L'viv, Ukraine
High Frequency Magneto-Impedance Effect in Glass-Coated Amorphous Co83.2 B3.3 Si5.9 Mn7.6 Microwires
Heebok Lee2, Yong-Seok Kim1, Seong-Cho Yu2
1Department of Physics Education, Kongju National University, Kongju, Korea
2Department of Physics Chungbuk National University, Chongju, Korea
Large Magnetocaloric Effect in Perovskite Manganites: MagneticEntropy Changes Above 300 K
Manh-Huong Phan1, Seong-Cho Yu1, A.N. Ulyanov1,2 and H.K. Lachowicz3
Department of Physics, Chungbuk National University, Cheongju, Korea
Donetsk Physico-Technical Institute of National Academy of Sciences, Donetsk, Ukraine
Institute of Physics, Polish Academy of Science, Warszawa, Poland
Effects of an External Magnetic Field on the Perpendicular Magnetic Anisotropy of Electrodeposited Micro-patterned Arrays
W. Y. Jeung, D. H. Choi, and K. H. Lee
Metal Processing Research Center, Korea Institute of Science and Technology,
Seoul, Korea,
Magnetometry of Monoatomic Layers and Spin Electronics Elements
J. Wrona, T. Stobiecki, M. Czapkiewicz, R. Rak
Department of Electronics, University of Mining and Metallurgy, Kraków, Poland
Magnetism of Nanocrystalline and Bulk FexNi23-xB6 (x=0, 1, 22 and 23) Alloys -- Experiment and Theory
B. Idzikowski and A. Szajek
Institute of Molecular Physics, Polish Academy of Sciences, Poznań, Poland
The Effect of Axial Dc-field on Transverse Permeability in Co-based Metallic Glass Ribbons
H. K. Lachowicz1, M. Kuźmiński1, Seong-Cho Yu2
1Institute of Physics, Polish Academy of Sciences, Warszawa, Poland
2Department of Physics, Chungbuk National University, Chongju, Korea
Microstructure and Magnetic Properties of NdFeB Magnets Fabricated by Current-Applied Pressure-Assisted Process
Y.B. Kim1, H.T. Kim1,S.H. Cho1,2, G.A. Kapustin3
1Korea Research Institute of Standards and Science, Korea
2Chungnam National University, Korea
3Kurchatov Institute, Russia
