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首页> 外文期刊>Applied Surface Science >Magnetization Reversal In Gd_(0.67)ca_(0.33)mno_3: Comparison Between Epitaxial Thin Films And Bulk
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Magnetization Reversal In Gd_(0.67)ca_(0.33)mno_3: Comparison Between Epitaxial Thin Films And Bulk

机译：Gd_（0.67）ca_（0.33）mno_3中的磁化反转：外延薄膜与块状薄膜的比较

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摘要

Rare-earth-based manganites ABO_3 may present interesting properties when the lanthanide (A-site) and/or the manganese (B-site) are partially substituted by divalent elements. Heavy lanthanides are particularly appealing because of the expected interplay between the intrinsic magnetic properties of the rare-earth element (Ln) and those of the ferromagnetic manganese sublattice. As such, a spin reorientation has been observed during magnetization-versus-temperature cycles due to a negative exchange interaction between Mn and Ln. We present herein high-quality epitaxial thin films (～200 nm thick) of Gd_(0.67)Ca_(0.33)MnO_3 deposited onto (1 0 0) SrTiO_3 substrates by pulsed-laser deposition. Enhanced properties were observed in comparison with bulk samples. The magnetic transition temperature T_c of the as-grown films is much higher than the corresponding bulk values. Most interesting, magnetization measurements performed under small applied fields, exhibit magnetization reversals below T_c, no matter whether the film is field-cooled (FC) or zero-field-cooled (ZFC). The reversal mechanism is discussed in terms of a negative exchange f-d interaction and magnetic anisotropy, this latter enhanced by strain effects induced by the lattice mismatch between the film and the substrate.
机译：当镧系元素（A-位）和/或锰元素（B-位）被二价元素部分取代时，稀土基锰矿ABO_3可能会表现出有趣的性能。由于稀土元素（Ln）与铁磁性锰亚晶格的固有磁性之间存在预期的相互作用，因此重镧系元素特别有吸引力。这样，由于Mn和Ln之间的负交换相互作用，在磁化-温度循环期间已经观察到自旋重新取向。我们在此介绍通过脉冲激光沉积在（1 0 0）SrTiO_3衬底上沉积的Gd_（0.67）Ca_（0.33）MnO_3的高质量外延薄膜（约200 nm厚）。与散装样品相比，观察到增强的性能。所生长的膜的磁转变温度T_c远高于相应的体积值。最有趣的是，在小的外加磁场下进行的磁化测量结果显示，无论薄膜是场冷（FC）还是零场冷（ZFC），磁化反转都低于T_c。从负交换f-d相互作用和磁各向异性讨论了这种反转机理，而磁各向异性则由薄膜和基底之间的晶格失配引起的应变效应而增强。

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