Dimensionality control of magnetic coupling at interfaces of cuprate–manganite superlattices,Materials Horizons

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Dimensionality control of magnetic coupling at interfaces of cuprate–manganite superlattices
Materials Horizons ( IF 12.2 ) Pub Date : 2021-06-19 , DOI: 10.1039/d1mh00790d
Guowei Zhou _{1,

2} , Huihui Ji ₁ , Zhi Yan ₁ , Penghua Kang ₁ , Zhilan Li ₁ , Xiaohong Xu _{1,

2}

Affiliation

The dimensionality of the crystal structure plays a vital role in artificial heterostructures composed of different transition metal oxides. Nonlinear layer-thickness dependence of the exchange bias effect was observed in high-quality SrCuO₂/La_0.7Sr_0.3MnO (LSMO) superlattices induced in the present work by dimensional evolution. In the SCO(n)/LSMO(8) superlattices with thickness below the critical value (5 u.c.), the exchange bias effect decreased and the saturated magnetization increased with increase in SCO thickness. By contrast, the exchange bias effect increased and the saturated magnetization decreased in S(n)L(8) superlattices with thickness above the critical value. This is because the lattice SCO material underwent a breathing-like structural transformation from the planar to a chain-like structure. The results indicate the interfacial superexchange coupling mainly present in the chain-like S(n)L(8) superlattices through X-ray absorption spectroscopy and first principles calculations. This superexchange coupling generated a weak localized magnetic moment to pin the adjacent ferromagnetic layer. However, in the thicker S(n)L(8) superlattices, evolution of magnetic properties was induced by the long-range antiferromagnetic order in the planar SCO layer. Our findings demonstrate that the dimensionality driven structural variation is an effective method to manipulate the electronic reconstruction and the associated physical properties, paving a pathway for the advancement of strongly correlated materials.

中文翻译：

铜酸盐-锰矿超晶格界面磁耦合的维数控制

晶体结构的维数在由不同过渡金属氧化物组成的人工异质结构中起着至关重要的作用。在本工作中通过尺寸演化诱导的高质量 SrCuO ₂ /La _0.7 Sr _0.3 MnO (LSMO) 超晶格中观察到交换偏置效应的非线性层厚依赖性。在厚度低于临界值（5 uc）的SCO( n )/LSMO(8)超晶格中，随着SCO厚度的增加，交换偏置效应降低，饱和磁化强度增加。相比之下，交换偏置效应增加，饱和磁化强度在 S( n)L(8) 厚度超过临界值的超晶格。这是因为晶格 SCO 材料经历了从平面到链状结构的呼吸式结构转变。结果表明，通过 X 射线吸收光谱和第一性原理计算，界面超交换耦合主要存在于链状 S( n )L(8) 超晶格中。这种超交换耦合产生了一个微弱的局部磁矩来固定相邻的铁磁层。然而，在较厚的 S( n)L(8) 超晶格，磁性的演变是由平面 SCO 层中的远程反铁磁顺序引起的。我们的研究结果表明，维度驱动的结构变化是操纵电子重建和相关物理特性的有效方法，为强相关材料的发展铺平了道路。

更新日期：2021-07-15

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