Magnetic and magnetoelectric properties of as-deposited and annealed BaTiO3-CoFe2O4 nanocomposite thin films
Magnetic and magnetoelectric properties of as-deposited and annealed BaTiO3-CoFe2O4 nanocomposite thin films
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DOI：
10.1088/0022-3727/43/28/285002
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发表时间：
2010-07-21
影响因子：
3.4
通讯作者：
Viehland, D.
中科院分区：
文献类型：
--
作者：
Bai, Feiming;Zhang, Huaiwu;Viehland, D.
研究了BaTiO 3-CoFe 2 O 4纳米复合薄膜的磁性能和磁电性能，并比较了CoFe 2 O 4（CFO）纳米棒嵌入BaTiO 3基体的沉积态和退火态的磁性能和磁电性能.在950 ℃退火2 h后，薄膜中的BaTiO 3相由（0 0 1）择优取向转变为（1 0 0）择优取向。在此期间，磁化强度急剧增加，从200到380 emu cm（-3）。通过磁力显微镜观察到的CFO纳米棒的磁性对比度的明显变化下施加的电场的复合膜。在10 MV m（-1）下退火的膜的ME电压系数估计为4.9 × 10（-9）sm（-1）或1.2 VOe（-1）cm（-1），尽管该值对于沉积态膜要低得多。结果表明，具有较好的相均匀性、多畴结构和未松弛应力的薄膜具有较高的ME效应。
The magnetic and magnetoelectric (ME) properties of as-deposited and annealed BaTiO3-CoFe2O4 nanocomposite films with CoFe2O4 (CFO) nano-rods embedded in a BaTiO3 matrix have been studied and compared. The BaTiO3 phase in the as-deposited film changed from (0 0 1) preferred orientation to (1 0 0) orientation after annealing at 950 degrees C for 2 h. In the meantime, the magnetization increased dramatically from 200 to 380 emu cm(-3). Distinct changes in magnetic contrast of the CFO nano-rods were observed by magnetic force microscopy under application of an electric field to the composite film. ME voltage coefficient as large as 4.9 x 10(-9) sm(-1) or 1.2 VOe(-1) cm(-1) was estimated for the annealed film under 10 MV m(-1), although the value was much lower for the as-deposited film. It is shown that higher ME effects can be found in films with good phase homogeneity, poly-domains and unrelaxed stress.