• Title/Summary/Keyword: 자성박막

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Influences of Plating Conditions on Magnetic Properties of Co-P Thin Films by Electroless Plating (무전해도금에 의한 코발트- 인 박막의 자성에 미치는 도금조건의 영향)

  • Choi, Byoung-Ik;Yeo, Woon-Kwan;Lee, Ju-Seong
    • Journal of the Korean institute of surface engineering
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    • v.19 no.1
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    • pp.3-12
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    • 1986
  • Influences of pH, temperature, and composition of bath on the deposition rate and the magnetic properties were studied for two kinds of electroless Co-P plating bath. The results obtained are as follows. Ammonia alkaline citrate bath was more stable than ammonia alkaline tartrate bath, and the film deposited from citrate bath gave a higher squareness. The magnetic properties of the film obtained from citrate bath greatly depended upon pH. Under the optimum conditions, the film deposited from citrate bath had coercive force of 330 Oe and squareness of 0.67. However the films deposited from tartrate bath had coercive force of 300 Oe and squareness of 0.58.

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Magnetic properties of $Mn^{+2}$ in Fe/MnO multilayers (Fe/MnO 다층박막에서의 $Mn^{+2}$의 자성연구)

  • 허재혁;채동훈;박성렬;이동렬;박수현;정윤희;전인준;김동언;이기봉
    • Journal of the Korean Vacuum Society
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    • v.8 no.3A
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    • pp.213-217
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    • 1999
  • Fe/MnO multilayers with different bilayer thicknesses were grown by pulsed laser deposition method. Grazing incidence X-ray reflectivity results showed obvious multilayer Bragg peaks implying highly layered samples and, through their analysis, some structural parameters were quantiatively estimated. From the X-ray diffraction peak corresponding to MnO(111), Mn-oxide turned out to be dominantly MnO. To characterize the magnetic properties of $Mn^{+2}$, XMCD were carried out. Magnetic moments of MnO near interfaces were ordered in the opposite direction to those of Fe.

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Magnetic Properties of a Perpendicular Magntic Film Made Electroless Plating a Succining Bath (Succinatw-Citrate 계 무전해 도금에 의한 수직자기 박막의 자성특성)

  • 김영우;박정일;고석수;이주성
    • Journal of the Korean institute of surface engineering
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    • v.21 no.1
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    • pp.3-9
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    • 1988
  • An electroless plating both for normal orientation of HCP-structure of Co-P to the film plane was developed. An ammonical succinate-citrate bath containg MnSo4, NiSO4 was studied Ni was codeposited into the films in order to decrease the saturation magentization (MS) since low Ms is necessary to decrease the magentizing fild. Mn was also codeposited to increase perpendicular orentaon of Co-P film. Effects on film composition and magnetic properties were studid in connection with follwing four factors such as concentration of NiSo4 and MnSo4, bath temp and pH.

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Growth of Zn0.4Fe2.6O4 Thin Films using Pulsed Laser Deposition and their Crystal Structural and Magnetic Properties (Pulsed Laser Deposition을 이용한 Zn0.4Fe2.6O4 박막의 합성과 그 결정성 및 자기적 특성의 연구)

  • Jang, A.N.;Song, J.H.;Park, C.Y.
    • Journal of the Korean Magnetics Society
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    • v.21 no.3
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    • pp.88-92
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    • 2011
  • We grew $Zn_{0.4}Fe_{2.6}O_4$ thin films using Pulsed Laser Deposition and studied their crystal structure and magnetical characteristics as a function of growth temperature ($T_g$). For the film with $T_g=300^{\circ}C$, X-ray reflections from ${\alpha}-Fe_2O_3$ and ZnO were observed. However, when $T_g$ was increased from 300 to $500^{\circ}C$, crystal structure of inverse spinel was stabilized with the crystal orientation of $Zn_{0.4}Fe_{2.6}O_4(111)/Al_2O_3(0001)$ without any detection of ${\alpha}-Fe_2O_3$ and ZnO phases. The surface morphology shows flattening behavior with increasing $T_g$ from 300 to $500^{\circ}C$. These observations indicate that Zn is substituted into tetrahedron A-site of the inverse-spinel $Fe_3O_4$. M-H curves exhibit clear ferromagnetism for the sample with $T_g=500^{\circ}C$ whereas no ferromagnetism is observed for the film with $T_g=300^{\circ}C$.

Regional Distribution of Isotropy Magnetic Property of Dual-type Giant Magnetoresistance-Spin Valve Multilayer (이중구조 거대자기저항-스핀밸브 박막의 자기등방성 영역분포에 관한 연구)

  • Khajidmaa, Purevdorj;Lee, Sang-Suk
    • Journal of the Korean Magnetics Society
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    • v.23 no.6
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    • pp.193-199
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    • 2013
  • The regional distribution of magnetic isotropy depending on the post annealing condition for the dual-type structure GMR-SV (giant magnetoresistance-spin valve) of NiFe/Cu/NiFe/IrMn/NiFe/Cu/NiFe multilayer was investigated. The rotation of in-plane ferromagnetic layer induced by controlment of the post annealing temperature inside of the vacuum chamber. The magnetoresistive curves of a dual-type IrMn based GMR-SV depending on the direction of the magnetization easy axis of the free layer and the pinned layer are measured by between $0^{\circ}$ and $360^{\circ}$ angles for the applied fields. The optimum annealing temperature having a steady and isotropy magnetic sensitivity of 1.52 %/Oe was $107^{\circ}C$ in the rotational section of $0{\sim}90^{\circ}$. By investigating the switching process of magnetization for an arbitrary measuring direction, the in-plane orthogonal magnetization for the dual-type GMR-SV multilayer can be used by a high sensitive biosensor for detection of magnetized micro-beads.

Soft Magnetic Properties of CoFeAlO Thin Films for Ultrahigh Frequency Applications (고주파용 CoFeAlO계 박막의 자기적 특성)

  • Kim, Hyeon-Bin;Yun, Dae-Sik;Ha, N.-D.;Kim, Jong-O
    • Journal of the Korean Magnetics Society
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    • v.15 no.1
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    • pp.17-20
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    • 2005
  • The influence of $O_2$ partial pressure on saturation mgnetization, coercivity, anisotropy field and effective permeability (over 1GHz) of as-deposited Co-Fe-Al-O thin films, which were fabricated by RF magnetron reactive sputtering method, were investigated. The $Co_{69.9}Fe_{20.5}A_{14.4O_{5.2}$ thin film fabricated at $O_2$ partial pressure of 4% exhibits the best magnetic softness with saturation magnetization 4${$pi}$Ms of 18.1 kG, coercivity of 0.82 Oe, anisotropy field ($H_k$) of Oe, and effective permeability (${\mu}_{eff}$) about 1,024 above 1 GHz. the electrical resistivity of Co-Fe-Al-O thin films were increased with increasing $O_2$ partial pressure, the electrical resistivity of $Co_{69.9}Fe_{20.5}A_{14.4O_{5.2}$ thin film with the best soft magnetic properties was 560.7 ${\mu}{\Omega}$am. Therefore, It is assumed that the good soft magnetic properties of $Co_{69.9}Fe_{20.5}A_{14.4O_{5.2}$ thin film results from high electrical resistivity and large anisotropy field.

Formation of Ferromagnetic Ge3Mn5 Phase in MBE-grown Polycrystalline Ge1-xMnx Thin Films (다결정 Ge1-xMnx 박막에서 Ge3Mn5 상의 형성과 특성)

  • Lim, Hyeong-Kyu;Anh, Tran Thi Lan;Yu, Sang-Soo;Baek, Kui-Jong;Ihm, Young-Eon;Kim, Do-Jin;Kim, Hyo-Jin;Kim, Chang-Soo
    • Journal of the Korean Magnetics Society
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    • v.19 no.3
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    • pp.85-88
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    • 2009
  • Magnetic phases of polycrystalline $Ge_{1-x}Mn_x$ thin films were studied. The $Ge_{1-x}Mn_x$ thin films were grown at $400^{\circ}C$ by using a molecular beam epitaxy. The $Ge_{1-x}Mn_x$thin films were p-type and electrical resistivities were $4.0{\times}10^{-2}{\sim}1.5{\times}10^{-4}ohm-cm$. Based on the analysis of magnetic characteristics and microstructures, it was concluded that the ferromagnetic phase formed on the $Ge_{1-x}Mn_x/SiO_2$/Si(100) thin films was $Ge_3Mn_5$ phase which has about 310 K of Curie temperature. Moreover, the $Ge_{1-x}Mn_x$ thin film which had $Ge_3Mn_5$ phase showed the negative magnetoresistance to be about 9% at 20 K when the magnetic field of 9 T was applied.

The Influence of $O_2$ Partial Pressure on Soft Magnetic Properties of As-deposited Fe-Sm-O Thin Films (산소분압에 따른 Fe-Sm-O계 박막의 연자기적 성질)

  • Yoon, T.S.;Cho, W.S.;Koo, E.S.;Li, Ying;Park, J.B.;Kim, C.O.
    • Korean Journal of Materials Research
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    • v.10 no.11
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    • pp.755-759
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    • 2000
  • The influence of $O_2$partial presure on saturation magnetization, coercivity and effective permeability(0.5~100MHz) of as-deposited Fe-Sm-O thin films, which were fabricated by RF magnetron reactive sputtering method, were investigated. The nanocrystalline Fe(sub)83.4Sm(sub)3.4O(sub)13.2 thin film fabricated at $O_2$partial pressure of 5% exhibits the best magnetic softness with saturation magnetization of 18kG, coercivity of 0.82 Oe and effective permeability about 2,600 at 0.5~100MHz. $\alpha$-Fe grain size is decreased with increasing $O_2$partial pressure. In case of $O_2$partial pressure of 10%, it is observed that FeO compound is formed and soft magnetic properties are decreased. The electrical resistivity of Fe-Sm-O thin films were increased with increasing $O_2$partial pressure, the electrical resistivity of Fe(sub)83.4Sm(sub)3.4O(sub)13.2 thin film with the best soft magnetic properties was 130 $\mu$$\Omega$cm. Therefore, It is assumed that the good soft magnetic properties of Fe(sub)83.4Sm(sub)3.4O(sub)13.2 thin film results from high electrical resistivity and decreasing $\alpha$-Fe grain size due to precipitation of Sm-Oxide phase.

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Magnetic Bio-Sensor Using Planar Hall Effect (평면홀 효과를 이용한 자기 바이오센서)

  • Oh, Sun-Jong;Hung, Tran Quang;Kumar., S. Ananda;Kim, Cheol-Gi;Kim, Dong-Young
    • Journal of the Korean Society for Nondestructive Testing
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    • v.28 no.5
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    • pp.421-426
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    • 2008
  • The magnetic bio-sensor used the PHR (planar hall resistance) effect generated by the free layer in spin-valve giant magnetoresistance structure of Ta/NiFe/CoFe/Cu/NiFe/IrMn/Ta. The PHR element with micrometer size was fabricated through the photolithograph and dry etching process. The PHR signal with magnetic field was measured under the conditions of with and without single magnetic bead. A single magnetic bead of diameter $2.8\;{\mu}m$ was successfully detected using the PHR sensor. Therefore, the high resolution PHR sensor can be applied to bio-sensor application utilizing the output voltage variation of the PHR signals in the presence and absence of a single magnetic bead.