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최등장(Deung Jang Choi),장은영(Eun Young Jang),이년종(Nyun Jong Lee),김태희(Tae Hee Kim) 한국자기학회 2007 韓國磁氣學會誌 Vol.17 No.5
Understanding the spin polarization (P) has been an ongoing research challenge. The Co<SUB>1 ? x</SUB>Mn<SUB>x</SUB> (x = 0.27, 1) and Co<SUB>1 ? x</SUB>Fe<SUB>x</SUB> (x = 0, 0.5, 1) films were prepared using UHV-MBE system. For these films, the magnetic properties and spin polarization were investigated using SQUID and Meservey-Tedrow technique, respectively. Although measured P is uncorrelated to the bulk magnetic moment (M) in Co-Fe and Ni-Fe alloy films, it correlates with M in some alloys such as Co-Mn and Ni-Cu. The results can be understood by the tunneling currents made up of the hybridized sp-d electrons near the Fermi-energy level. Our work shows the feasibility to tailor new materials with large P values.
장은영(Eun Young Jang),이년종(Nyun Jong Lee),최등장(Deung Jang Choi),김태희(Tae Hee Kim) 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.4
Magnetite (Fe3O4) is currently one of key materials for applications in magnetic storage and many bioinspired applications because bulk Fe₃O₄ has a high Curie temperature (Tc = ~850 K) and nearly full spin polarization at room temperature (RT). In this work, Fe₃O₄ nanoparticles with different sizes of 12 to 15 ㎚ were prepared in a well-controlled manner by a nonhydrolytic synthetic method. Here, we report the significant intergrain magneto-resistance (MR) of ~2 % at RT in Fe₃O₄ nanoparticle pellets. The tunneling conductance was also investigated based on the Brinkman model, as well. Our results show clearly that the surface or interfacial property of the particles plays a crucial role in the MR effect.