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6. Ultrafast ferromagnetic fluctuations preceding magnetoelastic first-order transitions

Author

Zhang, Zhao, Chen, Yanna, Yu, Dehong, Mole, Richard, Yu, Chenyang, Zhang, Zhe, Zhou, Houbo, Yan, Xuexi, Zhao, Xinguo, Ren, Weijun, Chen, Chunlin, Owada, Shigeki, Tono, Kensuke, Sugahara, Michihiro, Cao, Yue, Sakata, Osami, Bedzyk, Michael J., Li, Bing, Hu, Fengxia, Shen, Baogen, and Zhang, Zhidong

Subjects
Condensed Matter - Materials Science
Abstract

First-order magnetic transitions are of both fundamental and technological interest given that a number of emergent phases and functionalities are thereby created. Of particular interest are giant magnetocaloric effects, which are attributed to first-order magnetic transitions and have attracted broad attention for solid-state refrigeration applications. While the conventional wisdom is that atomic lattices play an important role in first-order magnetic transitions, a coherent microscopic description of the lattice and spin degrees of freedom is still lacking. Here, we study the magnetic phase transition dynamics on the intermetallic LaFe13-xSix, which is one of the most classical giant magnetocaloric systems, in both frequency and time domains utilizing neutron scattering and ultrafast X-ray diffraction. We have observed a strong magnetic diffuse scattering in the paramagnetic state preceding the first-order magnetic transition, corresponding to picosecond ferromagnetic fluctuations. Upon photon-excitation, the ferromagnetic state is completely suppressed in 0.9 ps and recovered in 20 ps. The ultrafast dynamics suggest that the magnetic degree of freedom dominates this magnetoelastic transition and ferromagnetic fluctuations might be universally relevant for this kind of compounds., Comment: 5 figures in the main text, plus supplementary information

Published
2020

8. Finite-temperature properties of PbTiO3 by molecular dynamics simulations.

Author

Wang, Jian-Tao, Bu, Kun, Hu, Fengxia, Wang, Jing, and Chen, Changfeng

Subjects
MOLECULAR dynamics, PHASE transitions, TRANSITION temperature, ELECTRIC fields, ADIABATIC temperature
Abstract

PbTiO 3 is a prototypical ferroelectric perovskite that is known to undergo a temperature driven ferroelectric tetragonal to paraelectric cubic phase transition, but the understanding of some key phenomena and associated mechanisms underlying this transition remains unclear. Here, using molecular dynamics simulations based on first-principles effective Hamiltonian, we show the behaviors of the phase transition temperature T c and adiabatic temperature change Δ T of PbTiO 3 under an external electric field and tensile stress along the [001] direction. Our results show that the electric field E induces rising T c via a linear relation T c ∝ 0.3083 E , rendering the phase transition to go from first-order with thermal hysteresis to second-order without thermal hysteresis above ∼ 200 kV/cm; meanwhile, a maximum electrocaloric response Δ T m a x ∼ 34 K is obtained under E = 500 kV/cm. Moreover, external stress (σ z) causes rising T c via a linear relation T c ∝ 160 σ z and improves the electrocaloric response Δ T m a x when combined with the electric field. The present results offer insights into the physical processes and mechanisms that dictate finite-temperature properties of ferroelectric perovskite oxides, laying a foundation for further exploration of this intriguing class of materials. [ABSTRACT FROM AUTHOR]

Published
2023
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11. Giant Tunability of Rashba Splitting at Cation‐Exchanged Polar Oxide Interfaces by Selective Orbital Hybridization

Author

Xu, Hao, primary, Li, Hang, additional, Gauquelin, Nicolas, additional, Chen, Xuejiao, additional, Wu, Wen‐Feng, additional, Zhao, Yuchen, additional, Si, Liang, additional, Tian, Di, additional, Li, Lei, additional, Gan, Yulin, additional, Qi, Shaojin, additional, Li, Minghang, additional, Hu, Fengxia, additional, Sun, Jirong, additional, Jannis, Daen, additional, Yu, Pu, additional, Chen, Gang, additional, Zhong, Zhicheng, additional, Radovic, Milan, additional, Verbeeck, Johan, additional, Chen, Yunzhong, additional, and Shen, Baogen, additional

Published
2024
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18. Emergent quasi-two-dimensional ferromagnetic state with perpendicular magnetic anisotropy at La0.7Sr0.3MnO3/SrCuO2 interface

Author

Shi, Wenxiao, primary, Zhang, Jing, additional, Zhan, Xiaozhi, additional, Li, Jialiang, additional, Li, Zhe, additional, Zheng, Jie, additional, Wang, Mengqin, additional, Zhang, Jine, additional, Zhang, Hui, additional, Zhu, Tao, additional, Chen, Yunzhong, additional, Hu, Fengxia, additional, Shen, Baogen, additional, Chen, Yuansha, additional, and Sun, Jirong, additional

Published
2024
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19. Metallic Conduction and Large Orbital Polarization in Ultrathin LaNiO3 Sublayer Achieved by Modulating Oxygen Octahedron Rotation in LaNiO3/CaTiO3 Superlattices

Author

Sun, Jirong, primary, Shi, Wenxiao, additional, Zhang, Jing, additional, Yu, Bowen, additional, Zheng, Jie, additional, Wang, Mengqin, additional, Li, Zhe, additional, Liu, Bang-Gui, additional, Chen, Yunzhong, additional, Hu, Fengxia, additional, Shen, Baogen, additional, and Chen, Yuansha, additional

Published
2024
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21. Reversible colossal barocaloric effect dominated by disordering of organic chains in (CH3–(CH2)n−1–NH3)2MnCl4 single crystals

Author

Gao, Yihong, Liu, Hongxiong, Hu, Fengxia, Song, Hongyan, Zhang, Hao, Hao, Jiazheng, Liu, Xingzheng, Yu, Zibing, Shen, Feiran, Wang, Yangxin, Zhou, Houbo, Wang, Bingjie, Tian, Zhengying, Lin, Yuan, Zhang, Cheng, Yin, Zhuo, Wang, Jing, Chen, Yunzhong, Li, Yunliang, Song, Youting, Shi, Youguo, Zhao, Tongyun, Sun, Jirong, Huang, Qingzhen, and Shen, Baogen

Published
2022
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27. Metallic Magnetic Materials

Author

Liu, J. Ping, Willard, Matthew, Tang, Wei, Brück, Ekkes, de Boer, Frank, Liu, Enke, Liu, Jian, Felser, Claudia, Fecher, Gerhard, Wollmann, Lukas, Isnard, Olivier, Burzo, Emil, Liu, Sam, Herbst, J. F., Hu, Fengxia, Liu, Yao, Sun, Jirong, Shen, Baogen, de Visser, Anne, Coey, J. M. D., editor, and Parkin, Stuart S.P., editor

Published
2021
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30. Emergent quasi-two-dimensional ferromagnetic state with perpendicular magnetic anisotropy at La0.7Sr0.3MnO3/SrCuO2 interface.

Author

Shi, Wenxiao, Zhang, Jing, Zhan, Xiaozhi, Li, Jialiang, Li, Zhe, Zheng, Jie, Wang, Mengqin, Zhang, Jine, Zhang, Hui, Zhu, Tao, Chen, Yunzhong, Hu, Fengxia, Shen, Baogen, Chen, Yuansha, and Sun, Jirong

Subjects
PERPENDICULAR magnetic anisotropy, X-ray absorption spectra, UNIT cell, DEGREES of freedom, CHARGE transfer, CURIE temperature, COPPER, MAGNETIC entropy
Abstract

Due to the strong interlayer coupling between multiple degrees of freedom, oxide heterostructures usually produce distinct interfacial phases with unexpected functionalities. Here, we report on the realization of quasi-two-dimensional ferromagnetic state in ultrathin La0.7Sr0.3MnO3 (LSMO) layer down to two unit cells (u.c.), being sandwiched by the planar infinite-layer structured SrCuO2 layers (P-SCO). We find the LSMO/P-SCO interface coupling has greatly suppressed the magnetic dead layer of LSMO, resulting in an emergent interfacial ferromagnetic phase. Thus, robust ferromagnetic order can be maintained in the 2 u.c.-thick LSMO layer (∼7.7 Å), showing a Curie temperature of ∼260 K and remarkable perpendicular magnetic anisotropy. X-ray absorption spectra reveal notable charge transfer from Mn to Cu at the interface, and thus, resulted preferential d3z2−r2 orbital occupation for interfacial Mn ions plays an important role in the inducing of perpendicular magnetic anisotropy in quasi-two-dimensional LSMO layer. Our work demonstrates a unique approach for tuning the properties of oxides via an interface engineering of oxygen coordination in perovskite/infinite-layer heterostructures. [ABSTRACT FROM AUTHOR]

Published
2024
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34. Layered Ferromagnetic Structure Caused by the Proximity Effect and Interlayer Charge Transfer for LaNiO3/LaMnO3 Superlattices

Author

Wang, Mengqin, primary, Zhu, Tao, additional, Bai, He, additional, Yin, Zhuo, additional, Xu, Hao, additional, Shi, Wenxiao, additional, Li, Zhe, additional, Zheng, Jie, additional, Gan, Yulin, additional, Chen, Yunzhong, additional, Shen, Baogen, additional, Chen, Yuansha, additional, Zhang, Qinghua, additional, Hu, Fengxia, additional, and Sun, Ji-Rong, additional

Published
2024
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38. A centrosymmetric hexagonal magnet with superstable biskyrmion magnetic nanodomains in a wide temperature range of 100K to 340K

Author

Wang, Wenhong, Zhang, Ying, Xu, Guizhou, Peng, Licong, Ding, Bei, Wang, Yue, Hou, Zhipeng, Zhang, Xiaoming, Li, Xiyang, Liu, Enke, Wang, Shouguo, Cai, Jianwang, Wang, Fangwei, Li, Jianqi, Hu, Fengxia, Wu, Guangheng, Shen, Baogen, and Zhang, Xi-xiang

Subjects
Condensed Matter - Materials Science
Abstract

Here, we report on the experimental discovery of biskyrmion magnetic nanodomains at RT and the observation of a biskyrmion-derived topological Hall effect (THE) in the centrosymmetric hexagonal MnNiGa magnet. Using a phase reconstruction technique based on a transport-of-intensity equation (TIE), we established the texture of the biskyrmion spin. Results from Lorentz transmission electron microscopy (TEM) and the topological Hall effect revealed that the biskyrmion phase is stable over a much wider temperature range (100 K to ~340K) and a larger magnetic field range in our material than in skyrmion-hosting bulk crystals reported previously[1-3,6]. The super-wide operating temperature and the broad range of material options indicate important progress toward the realization of skyrmion-based spintronic devices., Comment: Accepted for publication in advanced materials (DOI: 10.1002/adma.201600889)

Published
2016
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45. Dimensional control of interface coupling-induced ferromagnetism in CaRuO3/SrCuO2 superlattices.

Author

Zhe, Li, Wenxiao, Shi, Jine, Zhang, Jie, Zheng, Mengqin, Wang, ZhaoZhao, Zhu, Furong, Han, Hui, Zhang, Liming, Xie, Chen, Yunzhong, Hu, Fengxia, Shen, Baogen, Chen, Yuansha, and Sun, Jirong

Subjects
SUPERLATTICES, PERPENDICULAR magnetic anisotropy, FERROMAGNETISM, CHARGE transfer, CUPRATES, CURIE temperature, QUANTUM states, X-ray absorption
Abstract

Due to the strong interactions from multiple degrees of freedom at the interfaces, electron-correlated oxide heterostructures have provided a promising platform for creating exotic quantum states. Understanding and controlling the coupling effects at the oxide interface are prerequisites for designing emergent interfacial phases with desired functionalities. Here, we report the dimensional control of the interface coupling-induced ferromagnetic (FM) phase in perovskite-CaRuO3/infinite-layered-SrCuO2 superlattices. Structural analysis reveals the occurrence of chain-type to planar-type structural transitions for the SrCuO2 layer as the layer thickness increases. The Hall and magnetoresistance measurements indicate the appearance of an interfacial FM state in the originally paramagnetic CaRuO3 layers when the CaRuO3 layer is in proximity to the chain-type SrCuO2 layers; this superlattice has the highest Curie temperature of ~75 K and perpendicular magnetic anisotropy. Along with the thickness-driven structural transition of the SrCuO2 layers, the interfacial FM order gradually deteriorates and finally disappears. As shown by the X-ray absorption results, the charge transfer at the CaRuO3/chain-SrCuO2 and CaRuO3/plane-SrCuO2 interfaces are different, resulting in dimensional control of the interfacial magnetic state. The results from our study can be used to facilitate a new method to manipulate interface coupling and create emergent interfacial phases in oxide heterostructures. Harnessing Quantum States: A Breakthrough in Oxide Heterostructures Perovskite transition-metal oxides, known for their complex electron interactions, exhibit unique physical properties like superconductivity and magnetoresistance. However, layering these materials can result in new, unexpected behaviors at their interfaces. This study focuses on a layered structure of perovskite ruthenate and strontium cuprate. The research shows that by controlling the thickness of SCO layers in CRO/SCO superlattices, it is possible to induce ferromagnetism in CRO, which normally does not exhibit this property. The authors conclude that this manipulation of interface coupling can lead to new interfacial phases with potential applications in spintronics. The findings open up possibilities for future research into the control of quantum phases in complex oxide materials. This summary was initially drafted using artificial intelligence, then revised and fact-checked by the author. In this paper, we report the dimensional control of the interface coupling-induced ferromagnetic phase in perovskite-CaRuO3/infinite-layered-SrCuO2 superlattices. The Hall and magnetoresistance measurements indicate the appearance of an interfacial ferromagnetic state in the originally paramagnetic CaRuO3 layers when the CaRuO3 layer is in proximity to the chain-type SrCuO2 layers; this superlattice has the highest Curie temperature of ~75 K and perpendicular magnetic anisotropy. Along with the thickness-driven structural transition from chain-type to planar-type of the SrCuO2 layers, the interfacial ferromagnetic order gradually deteriorates and finally disappears. [ABSTRACT FROM AUTHOR]

Published
2024
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