应变外延膜中自适应孪生磁性纳米结构
Magnetic nanostructures by adaptive twinning in strained epitaxial films
摘要：
我们利用Fe 70 Pd 30磁性记忆合金的内在结构不稳定性，获得具有自组织纳米结构的功能外延薄膜。我们表明，54%的相干外延应变是可能的。薄膜实验和大规模第一性原理计算的结合使我们能够建立一个晶格弛豫机制，这是稳定材料所不期望的。我们确定了一个低的孪晶边界能量相比，一个高的弹性能作为自适应纳米孪晶的关键先决条件。我们的方法是通用的，因为它允许控制铁磁，铁弹和铁电材料的纳米结构和固有特性。
英文摘要：
We exploit the intrinsic structural instability of the Fe70Pd30 magnetic shape memory alloy to obtain functional epitaxial films exhibiting a self-organized nanostructure. We demonstrate that coherent epitaxial straining by 54% is possible. The combination of thin film experiments and large-scale first-principles calculations enables us to establish a lattice relaxation mechanism, which is not expected for stable materials. We identify a low twin boundary energy compared to a high elastic energy as key prerequisite for the adaptive nanotwinning. Our approach is versatile as it allows to control both, nanostructure and intrinsic properties for ferromagnetic, ferroelastic and ferroelectric materials.
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