Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, People's Republic of China.
J Phys Condens Matter. 2010 May 26;22(20):206005. doi: 10.1088/0953-8984/22/20/206005. Epub 2010 Apr 30.
Epitaxial orthorhombic La(0.5)Lu(0.5)Ni(0.5)Mn(0.5)O(3) (LLNMO) thin films deposited on Nb:SrTiO(3) (NSTO) substrates are prepared by pulsed laser deposition and their ferroelectricity and magnetism are investigated using various techniques. It is revealed that the as-prepared thin films are ferromagnetic (FM) insulators. The FM transition occurring at ∼ 125 K is evidenced by the well defined hysteresis at low temperature, with a saturated magnetic moment as high as 1.8 µ(B)/f.u. at ∼ 5 K. A reversible ferroelectric polarization of ∼ 0.2 µC cm(-2) below ∼ 140 K is also observed. The magnetism can be understood by the FM ordering associated with a partially ordered major Ni(2 +)-Mn(4 +) plus minor Mn(3+)-Ni(3+) configuration, while the ferroelectricity is argued to originate from the A-site disordering of La(3+) and Lu(3+).
在 Nb:SrTiO3（NSTO）衬底上通过脉冲激光沉积制备了外延正交 La(0.5)Lu(0.5)Ni(0.5)Mn(0.5)O3（LLNMO）薄膜，并使用各种技术研究了它们的铁电性和磁性。结果表明，所制备的薄膜是铁磁（FM）绝缘体。低温下明显的滞后现象表明在 ∼ 125 K 处发生了 FM 转变，在 ∼ 5 K 时饱和磁矩高达 1.8 µB/ f.u.。在 ∼ 140 K 以下还观察到可逆的约 0.2 µC cm(-2)的铁电极化。通过与部分有序的主要 Ni(2 +)-Mn(4 +)外加少量 Mn(3+)-Ni(3+)构型相关的 FM 有序可以理解磁性，而铁电性则归因于 La(3+)和 Lu(3+)的 A 位无序。
