http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Epitaxial Growth and Magnetodielectric Properties of Terbium-Iron-Garnet Thin Films
Naresh Kumar,정종훈,정명화,Namgun Kim,허남정,YongAn Park,Younghun Jo 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.1
We report on the (110)-oriented epitaxial growth of terbium-iron-garnet (Tb3Fe5O12, TbIG) thin films on Pt(111)/Gd3Ga5O12 (110) substrates by pulsed laser deposition, and their dielectric and magnetodielectric properties. High-quality TbIG thin films with clear interfaces can be achieved at a 750℃ substrate temperature and a 120 mTorr oxygen partial pressure, with subsequent annealing at 900℃ in air. The thickness of Pt is found to be crucial for epitaxial growth of TbIG and is optimized at 35 nm. The temperature-dependent dielectric constant shows a clear kink near 150 K due to a structural transition, similar to that of a single crystal. However, the magnetic feld dependence of the dielectric constant is an order of magnitude smaller than that of a single crystal and appears only when applied magnetic and electric felds are normal to the film plane, a sharp contrast to the case of a single crystal. We have attributed such differences to the rotation of magnetic easy axis from [1-11] to [110] and to the reduced magnetostriction due to the clamping effect from the substrate.