The antiferromagnetic state in ultrathin LaNiO3 layer supported by long-range exchange bias in LaNiO3/SrTiO3/La0.7Sr0.3MnO3 superlattices†,Journal of Materials Chemistry C

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The antiferromagnetic state in ultrathin LaNiO3 layer supported by long-range exchange bias in LaNiO3/SrTiO3/La0.7Sr0.3MnO3 superlattices†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-12-14 00:00:00 , DOI: 10.1039/c7tc04387b
Guowei Zhou _{1,

2,

2,

3,

4} , Huihui Ji _{1,

2,

3} , Jun Zhang _{1,

2,

3} , Yuhao Bai _{2,

3,

4} , Zhiyong Quan _{1,

2,

2,

3,

4} , Xiaohong Xu _{1,

2,

2,

3,

4}

Affiliation

Research on the novel antiferromagnetic (AFM) state in ultrathin LaNiO₃ (LNO) layers is very significant because bulk LNO is always exhibits paramagnetic state. Recently, an unexpected exchange bias effect has been observed in LNO-based heterostructures, but the reason for this effect is considered as the interfacial localized magnetic moment rather than the AFM state in ultrathin LNO layers. To this end, we have grown a prototypical superlattice composed of non-magnetic spacer layers as a LNO/spacer/La_0.7Sr_0.3MnO₃ (LSMO) system to support the AFM state in ultrathin LNO layers. Verified through X-ray absorption spectroscopy measurements, the interfacial localized magnetic moment induced by charge transfer can be effectively eliminated by inserting a spacer layer. Moreover, the long-range exchange bias effect can still be observed in these LNO/spacer/LSMO superlattices, and the strength of the coupling decreases with increasing non-magnetic spacer layer thickness. Therefore, this phenomenon suggests that the antiferromagnetic state in an ultrathin LNO layer plays a key role in the long-range exchange bias. Our findings will provide important clues for simplifying the behavior of confusing systems.

中文翻译：

LaNiO ₃ / SrTiO ₃ / La _0.7 Sr _0.3 MnO ₃超晶格的长期交换偏压支持的超薄LaNiO ₃层中的反铁磁状态†

在超薄LaNiO ₃（LNO）层中研究新型反铁磁（AFM）状态非常重要，因为块状LNO始终呈现顺磁状态。最近，在基于LNO的异质结构中观察到了意外的交换偏置效应，但这种效应的原因被认为是界面局部磁矩，而不是超薄LNO层中的AFM状态。为此，我们已经生长出由非磁性间隔层组成的原型超晶格，作为LNO /间隔物/ La _0.7 Sr _0.3 MnO ₃（LSMO）系统支持超薄LNO层中的AFM状态。通过X射线吸收光谱测量验证，通过插入间隔层可以有效消除由电荷转移引起的界面局部磁矩。此外，在这些LNO /间隔物/ LSMO超晶格中仍然可以观察到远距离交换偏压效应，并且耦合强度随着非磁性间隔层厚度的增加而降低。因此，该现象表明超薄LNO层中的反铁磁状态在长距离交换偏压中起关键作用。我们的发现将为简化混淆系统的行为提供重要线索。

更新日期：2017-12-14

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