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367 results on '"Yuan, Yanan"'

1. Modulating above-room-temperature magnetism in Ga-implanted Fe5GeTe2 van der Waals magnets

Author

Yuan, Yanan, Liu, Daxiang, Yu, Jingjing, Zhang, Guanhua, Chen, Xiang, Liu, Ruiqi, Wang, Siyu, Pei, Fangfang, Wei, Long, Li, Zhi, Guo, Junming, Wang, Shouguo, Liao, Zhaoliang, Yan, Wensheng, Qiu, Ziqiang, Yang, Mengmeng, and Li, Qian

Subjects
Quantum Physics, Physical Sciences, Condensed Matter Physics, Electrical and Electronic Engineering, Materials Engineering, Mechanical Engineering, Materials engineering, Nanotechnology, Condensed matter physics
Abstract

The creation of van der Waals (vdW) ferromagnets with tunable Curie temperature (TC) and magnetic anisotropy is essential in developing vdW magnet-based devices. Here, we report an effective and reliable method for modulating the magnetic properties of vdW Fe5GeTe2 by site-specific Ga+ implantation. In this study, we report an easy axis in the ab-plane for bulk Fe5GeTe2 (TC = 310 K) and an axis out of the plane for thin Fe5GeTe2 flakes (TC = 290 K). Combining element-resolved photoemission electron microscopy and spatially resolved magneto-optic Kerr microscopy, we find that the implantation of a tiny amount of 10−3 Ga+·Å−3 in Fe5GeTe2 greatly enhances the TC from 290 to 360 K and switches the magnetic easy axis from the out-of-plane c axis to the ab-plane. The room-temperature x-ray magnetic circular dichroism signal is enhanced from 0% to 9% at an implantation level of 10−2 Ga+·Å−3. These results provide new opportunities for tailoring the magnetic properties of vdW materials beyond room temperature.

Published
2023

2. Direct Imaging of Antiferromagnet‐Ferromagnet Phase Transition in van der Waals Antiferromagnet CrSBr

Author

Yu, Jingjing, Liu, Daxiang, Ding, Zhenyu, Yuan, Yanan, Zhou, Jiayuan, Pei, Fangfang, Pan, Haolin, Ma, Tianping, Jin, Feng, Wang, Lingfei, Zhu, Wenguang, Wang, Shouguo, Wu, Yizheng, Liu, Xue, Hou, Dazhi, Gao, Yang, Qiu, Ziqiang, Yang, Mengmeng, and Li, Qian

Subjects
Quantum Physics, Physical Sciences, antiferromagnet-ferromagnet phase transitions, direct imaging of AFM Neel vector orientation, magneto-optic anisotropy, spin-flop state, van der Waals antiferromagnets, Chemical Sciences, Engineering, Materials, Chemical sciences, Physical sciences
Abstract

The advent of van der Waals (vdW) ferromagnetic (FM) and antiferromagnetic (AFM) materials offers unprecedented opportunities for spintronics and magneto-optic devices. Combining magnetic Kerr microscopy and density functional theory calculations, the AFM-FM transition is investigated and a surprising abnormal magneto-optic anisotropy in vdW CrSBr associated with different magnetic phases (FM, AFM, or paramagnetic state) is discovered. This unique magneto-optic property leads to different anisotropic optical reflectivity from different magnetic states, permitting direct imaging of the AFM Néel vector orientation and the dynamic process of the AFM-FM transition within a magnetic field. Using Kerr microscopy, not only the domain nucleation and propagation process is imaged but also the intermediate spin-flop state in the AFM-FM transition is identified. The unique magneto-optic property and clear identification of the dynamics process of the AFM-FM phase transition in CrSBr demonstrate the promise of vdW magnetic materials for future spintronic technology.

Published
2023

20. A general criterion for solid instability and its application to creases

Author

Yang, Pengfei, Fang, Yaopeng, Yuan, Yanan, Meng, Shun, Imtiaz, Haroon, Liu, Bin, and Gao, Huajian

Subjects
Condensed Matter - Soft Condensed Matter, Physics - Classical Physics
Abstract

A general force-perturbation-based criterion for solid instability is proposed, which can predict instability including crease without priori knowledge of instability configuration. The crease instability is analyzed in detail, we found that the occurrence of solid instability does not always correspond to the non-positive definiteness of global stiffness matrix. An element stiffness-based criterion based on material stiffness is proposed as a stronger criterion in order to fast determine the occurrence of instability. This criterion has been shown to degenerate into the criterion for judging instability of certain known phenomena, such as necking and shear band phenomena. Besides, instability in strongly anisotropic materials is also predicted by the element stiffness-based criterion.

Published
2019

40. Whole exome sequencing identifies a novel missense FBN2 mutation co-segregating in a four-generation Chinese family with congenital contractural arachnodactyly

Author

Guo, Xingping, Song, Chunying, Shi, Yaping, Li, Hongxia, Meng, Weijing, Yuan, Qinzhao, Xue, Jinjie, Xie, Jun, Liang, Yunxia, Yuan, Yanan, Yu, Baofeng, Wang, Huaixiu, Chen, Yun, Qi, Lixin, and Li, Xinmin

Subjects
Biological Sciences, Bioinformatics and Computational Biology, Genetics, Rare Diseases, Clinical Research, Biotechnology, 2.1 Biological and endogenous factors, Aetiology, Alleles, Amino Acid Sequence, Animals, Arachnodactyly, Asian People, Base Sequence, China, Contracture, DNA, DNA Mutational Analysis, Fibrillin-2, Genotype, Humans, Male, Molecular Sequence Data, Mutation, Missense, Pedigree, Sequence Alignment, Whole exome sequencing, FBN2, Mutation, Congenital contractural arachnodactyly, Clinical Sciences, Genetics & Heredity, Clinical sciences
Abstract

BackgroundCongenital contractural arachnodactyly (CCA) is an autosomal dominant rare genetic disease, estimated to be less than 1 in 10,000 worldwide. People with this condition often have permanently bent joints (contractures), like bent fingers and toes (camptodactyly).Case presentationIn this study, we investigated the genetic aetiology of CCA in a four-generation Chinese family. The blood samples were collected from 22 living members of the family in the Yangquan County, Shanxi Province, China. Of those, eight individuals across 3 generations have CCA. Whole exome sequencing (WES) identified a missense mutation involving a T-to-G transition at position 3229 (c.3229 T > G) in exon 25 of the FBN2 gene, resulting in a Cys 1077 to Gly change (p.C1077G). This previously unreported mutation was found in all 8 affected individuals, but absent in 14 unaffected family members. SIFT/PolyPhen prediction and protein conservation analysis suggest that this novel mutation is pathogenic. Our study extended causative mutation spectrum of FBN2 gene in CCA patients.ConclusionsThis study has identified a novel missense mutation in FBN2 gene (p.C1077G) resulting in CCA in a family of China.

Published
2016

45. Surface‐Sensitive Detection of Magnetic Phase Transition in Van Der Waals Magnet CrSBr

Author

Pei, Fangfang, primary, Yu, Jingjing, additional, Zhou, Jiayuan, additional, Wang, Siyu, additional, Liu, Daxiang, additional, Yuan, Yanan, additional, Xi, Lei, additional, Jin, Feng, additional, Kan, Xucai, additional, Wang, Chao, additional, Wang, Lingfei, additional, Yan, Wensheng, additional, Wu, Yizheng, additional, Wang, Shouguo, additional, Chen, Kai, additional, Ma, Tianping, additional, Liu, Xue, additional, Yang, Mengmeng, additional, and Li, Qian, additional

Published
2023
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