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이광은(K. E. Lee),느반더(L. V. Tho),김상훈(S. H. Kim),김철기(C. G. Kim),김종오(C. O. Kim) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.4
Amorphous alloys of Co-rich magnetic amorphous films are well known as typical soft magnetic alloys. They are used for many kinds of electric and electronic parts such as magnetic recording heads, transformers and inductors. CoFeHfO thin films were prepared by RF magnetron reactive sputtering. The films were deposited onto Si(100) substrates with a power of 300W at room temperature. The reactive gas was introduced up to 10% (O₂/(Ar + O₂)) during deposition, and the Co<SUB>39</SUB>Fe<SUB>34</SUB>Hf<SUB>9.5</SUB>O<SUB>17.5</SUB> thin film exhibit excellent soft magnetic properties : saturation magnetization (4πM<SUB>s</SUB>) of 19 kG, magnetic coercivity (H<SUB>c</SUB>) of 0.37 Oe, anisotropy field (H<SUB>k</SUB>) of 48.62 Oe, and an electrical property is also shown to be as high as 300 μΩcm. It is assumed that the good soft magnetic properties of Co<SUB>39</SUB>Fe<SUB>34</SUB>Hf<SUB>9.5</SUB>O<SUB>17.5</SUB> thin film results from high electrical resistivity and large anisotropy field.
Tho, P.T.,Kim, D.H.,Phan, T.L.,Dang, N.V.,Lee, B.W. Elsevier 2018 Journal of magnetism and magnetic materials Vol.462 No.-
<P><B>Abstract</B></P> <P>We have studied the vertical hysteresis shift, the exchange bias, and the exchange spring effect in a polycrystalline sample of Bi<SUB>0.84</SUB>La<SUB>0.16</SUB>Fe<SUB>0.96</SUB>Ti<SUB>0.04</SUB>O<SUB>3</SUB> at morphotropic phase boundary. The magnetic coupling at the phase boundary causes the formation of pinned spin region, which induces the spin rotation inside the two structural phases. The exchange coupling between the pinned spin and the two phases act as hard/soft coupling layers, respectively. Dependence on the strength of the spin pinning, we observed various types of the exchange coupling at different temperature.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The phase boundary is directly separated two crystal structures into two grain size regions. </LI> <LI> High-temperature magnetic measurement is used to study the magnetic properties and magnetic interactions. </LI> <LI> The vertical hysteresis shift, the exchange bias, and the exchange spring effects are observed at different temperature and applied field conditions. </LI> <LI> The spin pinning at the phase boundary is explained for the various types of magnetic coupling and hysteresis behaviors. </LI> </UL> </P>
Tho, P.T.,Dang, N.V.,Nghia, N.X.,Khiem, L.H.,Xuan, C.T.A.,Kim, H.S.,Lee, B.W. Elsevier 2018 The Journal of physics and chemistry of solids Vol.121 No.-
<P><B>Abstract</B></P> <P>In this investigation, we have studied the crystal structure and magnetic properties of Zn doped Bi0.84La0.16FeO3 (<I>x</I> = 0.02–0.1) ceramics at the morphotropic phase boundary of rhombohedral and orthorhombic phases. Rietveld refinement of the obtained XRD patterns and Raman spectroscopy confirm the presence of multiphases crystal structure of <I>R3c</I> rhombohedral and <I>Pbam</I> orthorhombic. Room temperature magnetic measurements showed weak ferromagnetic ordering and enhancement in magnetization and coercivity with dominating of orthorhombic phase. The isothermal structural transition from <I>R3c</I> to <I>Pbam</I> is caused for the decrease in magnetization and the increase in coercivity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The crystal structure of Bi<SUB>0.84</SUB>La<SUB>0.16</SUB>Fe<SUB>1-x</SUB>Zn<SUB>x</SUB>O<SUB>3</SUB> at the morphotropic phase boundary. </LI> <LI> The microstructure reveals the coexistence crystal phase and their phase boundary. </LI> <LI> The isothermal structural transition induces the change in magnetic properties. </LI> <LI> The vertical shift (exchange bias) is observed in compounds. </LI> </UL> </P>