• Title, Summary, Keyword: Fe-based thin film

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Properties of Fe-based Soft magnetic Thin Film with Hybrid Structures (Hybrid 구조의 Fe계 연자성 박막의 특성)

  • 송재성;이원재;허정섭;김현식;오영우
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.13 no.11
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    • pp.963-968
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    • 2000
  • Magnetic properties and microstructures of Fe$\_$93-x/Zr$_3$B$_4$Ag$\_$x/ thin films were investigated as a function of addition of element Ag, (X$\_$Ag/=0 to 6 at.%) and annealing temperature, T$\_$a/=300$\^{C}$ to 600$\^{C}$. In the case of adding Ag, magnetic properties of Fe$\_$93-x/Zr$_3$B$_4$Ag$\_$x/ thin films were improved than those of Ag-free Fe$\_$93/Zr$_3$B$_4$thin films. The prominent soft magnetic properties with coercivity of 1.1 Oe, saturation magnetization of 2.2 T and permeability of 5400 at 50㎒ were obtained from Fe$\_$88/Zr$_3$B$_4$Ag$\_$5/ thin film annealed was lower than that of Fe-base or Co-base thin films reported previously. Such enhanced magnetic properties are presumably attributed to the format in ultra fine grains. Also, the reduced eddy current loss in the annealed sample is due to refined micro magnetic domains with increasing the amount of Ag in Fe$\_$93-x/Zr$_3$B$_4$Ag$\_$x/ thin films.

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Evaluation of the Residual Stress of Thin Film Based on the Nanoindentation and Finite Element Analysis. (유한요소해석과 나노인덴테이션을 활용한 박막의 잔류응력 평가)

  • 황병원;김영석;박준원
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.355-358
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    • 2003
  • To estimate the residual stresses in the thin film and surface coatings, combined method based on nanoindentation and finite element (FE) analysis was developed. A simple equation for estimating the residual stress was composed of the hardness and the parameters which can be driven from the nanoindentation loading and unloading behaviors. FE analysis on the nanoindentation procedure under the various residual stress levels was performed to determine the parameters that included in the equation. The equation showed a good coincidence between the estimated residual stresses and those for the FE analysis. Thus the proposed method was considered as a useful method for estimating the residual stresses in the thin film without stress free specimen.

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Bonding And Anti-bonding Nature of Magnetic Semiconductor Thin Film of Fe(TCNQ:tetracyanoquinodimethane)

  • Jo, Junhyeon;Jin, Mi-jin;Park, Jungmin;Modepalli, Vijayakumar;Yoo, Jung-Woo
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.294-294
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    • 2014
  • Developing magnetic thin films with desirable physical properties is a key step to promote research in spintronics. Organic-based magnetic material is a relatively new kind of materials which has magnetic properties in a molecular and microscopic level. These materials have been constructed by the coordination between 3d transition metal and organic materials producing long-range magnetic orders with a relatively high transition temperature. However, these materials were mostly synthesized as a form of powder, which is difficult to study for their physical properties as well as apply for electronic/spintronic devices. In this study, we have employed physical vapor deposition (PVD) to develop a new organic-based hybrid magnetic film that is achieved by the coordination of Fe and tetracyanoquinodimethane (TCNQ). The IR spectra of the grown film show modified CN vibration modes in TCNQ, which suggest a strong bonding between Fe and TCNQ. The thin film has both ferromagnetic and semiconducting behaviors, which is suitable for molecular spintronic applications. The high resolution photoemission (HRPES) spectra also show shift of 1s peak point of nitrogen and the carbon 1s peaks display traces of charge transfer from Fe to TCNQ as well as shake-up features, which suggest strong bonding and anti-bonding nature of coordination between Fe and TCNQ.

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Improved Resistance Switching Characteristics of BiFeO3 Thin Film by Increasing the Annealing Temperature

  • Miao, Zhilei;Wang, Wei;Yuan, Rongchun;Zhu, Jun;Wu, Shudong;Chen, Haitao;Zeng, Xianghua;Wang, Qiang
    • Nano
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    • v.13 no.9
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    • pp.1850111.1-1850111.8
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    • 2018
  • We have fabricated $BiFeO_3$ thin film deposited on Pt/Ti/SiO2/Si substrates by the chemical solution deposition method. The effects of annealing temperature on the thin film structure, resistance switching (RS) properties, conduction mechanisms are investigated. It exhibits improved RS window with high ON/OFF ratio (${\sim}10^4$) for the sample annealed at $650^{\circ}C$. XPS characterization indicates that cation ratio of $Fe^{2+}/Fe^{3+}$ is increased with increasing annealing temperature. Crystal lattice distortion generated by $Fe^{2+}$ cations, along with oxygen vacancies, commonly contribute to opening the RS window and the increment of conductive filaments. The film's conduction mechanisms under different annealing temperatures are fully discussed. The RS properties of this system can be effectively improved by increasing the annealing temperature, which is crucial prerequisite for future applications of BFO-based thin film device in resistance random access memory.

Preparation of LaGaO3 Based Oxide Thin Film on Porous Ni-Fe Metal Substrate and its SOFC Application

  • Ju, Young-Wan;Matsumoto, Hiroshige;Ishihara, Tatsumi;Inagaki, Toru;Eto, Hiroyuki
    • Journal of the Korean Ceramic Society
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    • v.45 no.12
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    • pp.796-801
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    • 2008
  • $LaGaO_3$ thin film was prepared on Ni-Fe metal porous substrate by Pulsed Laser Deposition method. By the thermal reduction, the dense $NiO-{Fe_3}{O_4}$ substrate is changed to a porous Ni-Fe metal substrate. The volumetric shrinkage and porosity of the substrate are controlled by the reduction temperature. It was found that a thermal expansion property of the Ni-Fe porous metal substrate is almost the same with that of $LaGaO_3$ based oxide. $LaGaO_3$ based electrolyte films are prepared by the pulsed laser deposition (PLD) method. The film composition is sensitively affected by the deposition temperature. The obtained film is amorphous state after deposition. After post annealing at 1073K in air, the single phase of $LaGaO_3$ perovskite was obtained. Since the thermal expansion coefficient of the film is almost the same with that of LSGM film, the obtained metal support LSGM film cell shows the high tolerance against a thermal shock and after 6 min startup from room temperature, the cell shows the almost theoretical open circuit potential.

Fully Integrated Electromagnetic Noise Suppressors Incorporated with a Magnetic Thin Film on an Oxidized Si Substrate

  • Sohn, Jae-Cheon;Han, S.H.;Yamaguchi, Masahiro;Lim, S.H.
    • Journal of Magnetics
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    • v.12 no.1
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    • pp.21-26
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    • 2007
  • Si-based electromagnetic noise suppressors on coplanar waveguide transmission lines incorporated with a $SiO_2$ dielectric layer and a nanogranular Co-Fe-Al-O magnetic thin film are reported. Unlike glass-based devices, large signal attenuation is observed even in the bare structure without coating the magnetic thin film. Much larger signal attenuation is achieved in fully integrated devices. The transmission scattering parameter ($S_{21}$) is as small as -90 dB at 20 GHz at the following device dimensions; the thicknesses of the $SiO_2$ and Co-Fe-Al-O thin films are 0.1 $\mu$m and 1 $\mu$m, respectively, the length of the transmission line is 15 mm, and the width of the magnetic thin film is 2000 $\mu$m. In all cases, the reflection scattering parameter ($S_{11}$) is below -10 dB over the whole frequency band. Additional distributed capacitance formed by the Cu transmission line/$SiO_2$/Si substrate is responsible for these characteristics. It is considered that the present noise suppressors based on the Si substrate are a first important step to the realization of MMIC noise suppressors.

Analysis of Microwave Permeability and Damping Constant in Amorphous CoFeHfO Thin Film (비정질 CoFeHfO 박막 재료의 마이크로파 투자율 및 감쇠상수 분석)

  • Kim, Dong-Young;Yoon, Seok-Soo
    • Journal of the Korean Magnetics Society
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    • v.19 no.4
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    • pp.147-151
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    • 2009
  • The saturation magnetization and uniaxial anisotropy constant were obtained from magnetization and torque curves measurement in high resistive CoFeHfO thin film. The measured results were used for the analysis of the microwave complex permeability based on Landau-Lifshitz-Gilbert (LLG) theory. The high resistive CoFeHfO thin films showed very low damping constants of ${\alpha}$ = 0.014. The results are interpreted in terms of various magnetic phase with very low damping constant, which were existing inside the CoFeHfO thin film, through the linewidth analysis of the ferromagnetic resonance signal with magnetic field.

Effect of substrate orientation on ferroelectric behavior of monoclinic BiFeO3 thin film

  • Jeon, B.C.;Yang, S.M.;Chae, S.C.
    • Current Applied Physics
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    • v.17 no.5
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    • pp.684-687
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    • 2017
  • We report on ferroelectric properties of the monoclinic $BiFeO_3$ thin films grown on (001) and (110) $SrTiO_3$ substrates. Structural analysis using X-ray diffractometer and the electrical characterization of ferroelectricity reveal that the elastic constraint induced by the crystallographic orientation affects the remnant polarization values and retention properties of $BiFeO_3$. The in-depth analysis based on the Williamson-Hall plot and thermodynamic analysis manifests that inhomogeneous strain related to the strain relaxation in the film is responsible for the change of the out-of-plane polarization and retention property of $BiFeO_3$ thin films depending on the substrate orientation.

Magnetic and Magnetostrictive Properties of Nanogranular Co-Fe Based Alloys: A Particular Emphasis on High Frequency Applications

  • Sohn, J.C.;Byun, D.J.;Lim, S.H.
    • Journal of the Korean Magnetics Society
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    • v.13 no.4
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    • pp.133-154
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    • 2003
  • A comprehensive review is given in this article on magnetic and magnetostrictive properties of nanogranular Co-Fe based alloys, with a particular emphasis on high frequency applications. Structural and physical properties are firstly described, followed by magnetic and magnetostrictive properties. Materials of both thin film and bulk forms are considered. A detailed description on high frequency characteristics of Co-Fe based soft magnetic thin films is then presented.

Characteristics of Amorphous Fe-based Thin Firms with Low Core Losses (저손실 Fe-계 비정질 박막의 자기적 특성)

  • 민복기;김현식;송재성;허정섭;오영우
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.633-636
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    • 1999
  • In this study, we have fabricated amorphous FeZrBAg thin films with low core losses by using DC magnetron sputtering method. After deposition, rotational field annealing (RFA) method was performed in the dc field of 1.5 kOe. The amorphous FeZrBAg thin films produced by annealing at 35$0^{\circ}C$ was founded to have high permeability of 8680 at 100 MHz, 0.2 mOe, low coercivity of 0.86 Oe high magnetization of 1.5 T and very low core loss of 1.3 W/cc at 1 MHz, 0.IT respectively. Excellent soft magnetic properties in a amorphous FeZrBAg thin films in the present study are presumably the homogeneous formation of very fine bcc $\alpha$-Fe crystalline with the 8.2 nm in an amorphous FeZrBAg thin film matrix.

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