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Towards magnetism in pigeon MagR: Iron- and iron-sulfur binding work indispensably and synergistically

Zoological Research 2023年第1期44卷 142-152页

作者： Yajie Zhou Tianyang Tong Mengke Wei Peng Zhang Fan Fei Xiujuan Zhou Zhen Guo Jing Zhang Huangtao Xu Lei Zhang Shun Wang Junfeng Wang Tiantian Cai Xin Zhang Can Xie Institutes of Physical Science and Information Technology Anhui UniversityHefeiAnhui 230039China High Magnetic Field Laboratory Hefei Institutes of Physical ScienceChinese Academy of SciencesScience IslandHefeiAnhui 230031China Department of Anatomy Anhui Medical UniversityHefeiAnhui 230032China Science Island Branch of Graduate School University of Science and Technology of ChinaHefeiAnhui 230036China School of Life Sciences Peking UniversityBeijing 100871China International Magnetobiology Frontier Research Center Science IslandHefeiAnhui 230031China Department of Biological Chemistry and Molecular Pharmacology Harvard Medical School250 Longwood AvenueBostonMA 02115USA

The ability to navigate long distances is essential for many animals to locate shelter,food,and breeding grounds.Magnetic sense has evolved in various migratory and homing species to orient them based on the geomagnetic field.A highly conserved ironsulfur cluster assembly protein IscA is proposed as an animal magnetoreceptor(MagR).Iron-sulfur cluster binding is also suggested to play an essential role in MagR magnetism and is thus critical in animal magnetoreception.In the current study,we provide evidence for distinct iron binding and iron-sulfur cluster binding in MagR in pigeons,an avian species that relies on the geomagnetic field for navigation and homing.Pigeon MagR showed significantly higher total iron content from both iron-and ironsulfur binding.Y65 in pigeon MagR was shown to directly mediate mononuclear iron binding,and its mutation abolished iron-binding capacity of the protein.Surprisingly,both iron binding and iron-sulfur binding demonstrated synergistic effects,and thus appear to be integral and indispensable to pigeon MagR magnetism.These results not only extend our current understanding of the origin and complexity of MagR magnetism,but also imply a possible molecular explanation for the huge diversity in animal magnetoreception.

关键词： Animal magnetoreception Iron-sulfur cluster binding Iron binding magnetism Magnetoreceptor(MagR)

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magnetism and piezoelectricity of hexagonal boron nitride with triangular vacancy

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Chinese Physics B 2018年第1期27卷 450-455页

作者：赵路丝陈春平刘林林于洪侠陈怡王晓春 Institute of Atomic and Molecular Physics Jilin University Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy (Jilin University)

First-principle calculations reveal that the configuration system of hexagonal boron nitride （h-BN） monolayer with triangular vacancy can induce obvious magnetism, contrary to that of the nonmagnetic pristine boron nitride monolayer. Interestingly, the h-BN with boron atom vacancy （VB-BN） displays metallic behavior with a total magetic moment being 0.46μB per cell, while the h-BN with nitrogen atom vacancy （VN-BN） presents a half-metallic characteristic with a total magnetic moment being 1.0μB per cell. Remarkably, piezoelectric stress coefficient ell of the VN-BN is about 1.5 times larger than that of pristine h-BN. Furthermore, piezoelectric strain coefficient dll （12.42 μm/V） of the VN-BN is 20 times larger than that of pristine h-BN and also one order of magnitude larger than the value for the h-MoS2 monolayer, which is mainly due to the spin-down electronic state in the VN-BN system. Our study demonstrates that the nitrogen atom vacancies can be an efficient route to tailoring the magnetic and piezoelectric properties of h-BN monolayer, which have promising performances for potential applications in nano-electromechanical systems （NEMS） and nanoscale electronics devices.

关键词： first-principle magnetism piezoelectric nano-electromechanical systems

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Dynamical investigation of tunable magnetism in Au@Ni-carbide nanocrystals by a combined soft and hard X-ray absorption spectroscopy

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Nano Research 2022年第5期15卷 4320-4326页

作者： Weifeng Huang Jianxin Kang Tingwen Chen Dawei Pang Lihua Wang Hang Wei Changchun Yang Dongfeng Zhang Lin Guo College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China School of Electronic Engineering Jiujiang UniversityJiujiang 332005China School of Chemistry Beihang UniversityBeijing 100191China Institute of Microstructure and Property of Advanced Materials Beijing University of TechnologyBeijing 100124China

Nickel based magnetic nanocrystals have been widely applied in magnetic and catalytic facilities.Tunable magnetic properties of nickel can be easily obtained via non-magnetic doping or phase transformation.However,phase transformation from face centered cubic(fcc)to hexagonal close packed(hcp)induced magnetism adjustment of Ni are always confused with nickel carbide(Ni_(3)C),due to the similar atomic structures of hcp-Ni and Ni3C.Here,we present series of Au@Ni-carbide magnetic materials achieved from the controlled carbonation of Au@Ni core-shell structures,whose magnetism is tunable by adjusting the amount of carbon in the Ni layer.Ex-situ hard X-ray absorption spectroscopy(XAS)at the metal K edge and soft XAS at both metal L edge and carbon K edge provide solid evidence for the carbonation process from fcc-Ni to Ni_(x)C,rather than phase transformation to hcp-Ni.Further investigation reveals that the magnetism of the hybrids is mainly contributed from the residual fcc-Ni.The result represents an accurate and effective way to distinguish hexagonal Ni_(3)C from hcp-Ni,and provides the pathway to control magnetism of Ni-based materials for applications.

关键词： X-ray absorption spectroscopy soft X-ray absorption spectroscopy carbide nickel carbonation process magnetism

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magnetism tuned by intercalation of various metal ions in coordination polymer

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Chinese Chemical Letters 2019年第7期30卷 1390-1392页

作者： Chengfei Wang Wei Zhang Wenwu Li Yuanyuan Zhang Xiaodong Tang Ming Hu State Key Laboratory of Precision Spectroscopy Key Laboratory of Polar Materials and Devices (MOE) School of Physics and Materials Science East China Normal University

Incorporation of guest ions into porous frameworks changed magnetism of the host materials significantly. However, in most cases, the guest ions were monovalent due to lack of reliable method to insert divalent and trivalent guest ions. In this work, we demonstrated that divalent and trivalent metal ions could be inserted into frameworks of a coordinate polymer, Cu3[Fe(CN)6]2, through electrochemical intercalation. The magnetism of the host frameworks was changed among paramagnetic, superparamagnetic, and ferromagnetic as demonstrated by physical property measurement system (PPMS). Furthermore, the magnetization of the frameworks under low temperatures correlated to the guest ions significantly. The ionic radius and net charge of the guest ions influenced the intercalation amount of the guest ions, therefore affected the valence change of Fe3+ ions in the host frameworks, finally leading to variation of the magnetism of the host materials.

关键词： Electrochemistry magnetism Guest ions Prussian Blue analogues

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石墨烯中单原子空位缺陷磁性的调控

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Science Bulletin 2020年第3期65卷 194-200页

作者：张钰高飞高世武何林 Center for Advanced Quantum Studies Department of PhysicsBeijing Normal UniversityBeijing 100875China Computational Science Research Center ZPark IIBeijing 100193China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

本征的石墨烯是非磁性的,如果在石墨烯中引入单原子空位缺陷,则会在缺陷附近产生局域的σ电子和准局域的π电子,进而使该体系具有局域磁矩.理论预言,通过调控局域的σ电子和准局域的π电子之间的相互作用强度,可以实现调控该体系中局域... 详细信息

本征的石墨烯是非磁性的,如果在石墨烯中引入单原子空位缺陷,则会在缺陷附近产生局域的σ电子和准局域的π电子,进而使该体系具有局域磁矩.理论预言,通过调控局域的σ电子和准局域的π电子之间的相互作用强度,可以实现调控该体系中局域磁矩的大小.然而,迄今为止,实验上很难实现对σ电子和π电子相互作用强度的调控.本文利用扫描隧道显微镜(STM)的针尖成功实现了对石墨烯中单原子空位缺陷局域磁矩的调控.首先,结合自旋极化的STM实验和第一性原理计算,作者证实石墨烯单原子空位缺陷中局域的σ电子和准局域的π电子之间的相互作用会诱导π电子产生两个自旋劈裂的态密度峰.其次,通过改变STM针尖与石墨烯的距离来改变它们之间的范德瓦尔斯力,进而改变石墨烯单原子空位缺陷附近碳原子的空间结构,而缺陷在空间结构上的差异大大改变了该体系中σ电子和π电子之间的相互作用强度.作者利用该方法成功操控了π电子局域磁矩的大小和相对于σ电子局域磁矩的方向,实现了三种不同磁性态.这三种磁性态在理论计算上也得到了证实,它们对应的局域磁矩分别为1.6μB,0.5μB和0μB.

关键词： Graphene Single-carbon vacancy Magnetic moment Tunable magnetism Scanning tunnelling microscopy

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Co-doping effects on magnetism and superconductivity in the 112-type EuFeAs2 system

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Science China(Physics,Mechanics & Astronomy) 2021年第6期64卷 98-105页

作者： Jia Yu Tong Liu BinBin Ruan Kang Zhao QingSong Yang MengHu Zhou ZhiAn Ren Institute of Physics and Bejing National Laboratory for Condensed Matter Physics Chinese Academy of SciencesBejing 100190China School of Physical Sciences University of Chinese Academy of SciencesBejing 100049China Songshan Lake Materials Laboratory Dongguan 523808China School of Physics Sun Yat-sen UniversityGuangzhou 510275China

The discovery of EuFeAs_(2),currently the only charge-neutral parent phase of the 112-type iron-pnictide system,provides a new platform for the study of elemental doping effects on magnetism and superconductivity(SC).In this study,a series of polycrystalline EuFe_(1-y)Co_(y)As_(2)and Eu_(0.9)Pr_(0.1)Fe_(1-y)Co_(y)As_(2)samples are synthesized through solid-state reaction,and the evolutions of SC and magnetism with Co doping in EuFeAs_(2)and Eu_(0.9)Pr_(0.1)FeAs_(2)are investigated by electrical transport and magnetic susceptibility measurements.For EuFe_(1-y)Co_(y)As_(2),the Eu-related antiferromagnetic(AFM)transition around 40 K is barely affected by Co doping,while the Fe-related spin density wave(SDW)transition temperature drops rapidly.Meanwhile,SC is induced by a trace amount of Co doping,with a highest transition temperature T_(c)~28 K found in EuFe0.9Co0.1As_(2).For the Eu_(0.9)Pr_(0.1)Fe1-yCo_(y)As_(2)series,the magnetism and superconductivity show similar evolutions upon Co doping,and the highest T_(c)is enhanced to 30.6 K with an optimum doping level y~0.07.Our results shed light on the competition between SC and SDW with Co doping in the 112-type EuFeAs_(2)system.

关键词： EuFeAs_(2) iron-based superconductors superconductivity magnetism

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When thermoelectric materials come across with magnetism

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Rare Metals 2021年第4期40卷 752-766页

作者： Chen-Chen Zhao Chong Xiao Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031China

Nowadays,thermoelectric materials have attracted a lot of attention as they can directly convert heat into electricity and vice versa.However,while strenuous efforts have been made,those conventional strategies are still inevitably going to meet their performance optimization limits.For this reason,brand new strategies are badly needed to achieve further enhancement.Here,the roles played by magnetism in recent advances of thermoelectric optimization are concluded.Firstly,magnetic thermoelectric materials can just be treated like other normal materials because the use of universal optimization strategies can still get good results.So,it is not a situation which is all or nothing and the tactics of using magnetism for thermoelectric optimization can coexist with other strategies.Besides,through magnetic doping,we can introduce and adjust magnetism in materials for further optimization.magnetism provides more possibilities in thermoelectric optimization as it can directly influence the spin states in materials.Furthermore,in the form of magnetic secondphase nanoclusters,magnetism can be introduced to thermoelectric materials to conquer the dilemma that the solid solubility of many magnetic ions in thermoelectric materials is too low to have any significant effect on thermoelectric properties.Finally,when exposed to an external magnetic field,topological materials can rely on its unique band structures to optimize.

关键词： Thermoelectricity Magnetic thermoelectric materials magnetism Magnetic doping Magnetic second phase

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Influence of transition metals(Sc,Ti,V,Cr,and Mn)doping on magnetism of CdS

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Chinese Physics B 2020年第11期29卷 485-491页

作者：索忠强戴剑锋高姗姗高浩然 School of Science Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Nanoferrous Metals Lanzhou 730050China

The influence of transition metals(Sc,Ti,V,Cr,and Mn)doping at different distances on the magnetism of CdS is studied by using generalized gradient approximation combined with Hubbard U in the VASP package.The results show that the doping systems are more stable,easy to form,and the wurtzite structure of CdS is not changed.It is found that the systems are antiferromagnetic(AFM)when nearest neighbor doping,which is attributed to the direct charge transfers between two impurity ions.The systems are ferromagnetic(FM)when the doping distance increases further,since the double exchange interactions are observed among the 3d orbital of the transition metal,the Cd-5s and the S-3p orbitals are at conduction band minimum.We also found that the total magnetic moment of each ferromagnetic system increases with the order of SC to Mn-doping,the spin polarizability of Cr-doping system is 100%.The estimated Curie temperature indicates that the Cr-and Mn-doped CdS in this paper can achieve room-temperature ferromagnetic characteristics,especially the Cr doping is the most prominent.And TM-doping does not destroy the semiconductor characteristics of the system.Therefore,the TM-doped CdS can be used as an ideal dilute magnetic semiconductor functional material.

关键词： transition metals doping electronic structure magnetism CdS Curie temperature

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Structure,magnetism and magnetic thermal properties of heavy rare earth Tb1-xTmxFeO3(x=0.00,0.15,0.25) polycrystalline samples

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Journal of Rare Earths 2020年第6期38卷 600-605页

作者： Xiang Jin Jianjun Zhao Hongwei Chen Fengze Cao Li Cheng Taichao Su Wenxing Wang Jia Liu Yi Lu Physics Institute of Science and Technology Baotou Teachers CollegeBaotou 014030China Key Laboratory for magnetism and Magnetic Material of Inner Mongolia Baotou Teachers CollegeBaotou 014030China Institute of Materials Science and Engineering Henan Polytechnic UniversityJiaozuo 454000China Management Department of Scientific Research Institute Inner Mongolia First Machinery Group Co.Ltd.Baotou 014032China

Tb1-xTmxFeO3(x = 0.00,0.15,0.25) polycrystalline series were synthesized using a solid-state reaction.Our results show that all three prepared samples are in a distorted orthogonal structure and their space group is pbnm.When the Tm3+doping amount increases,the characteristics of the spin-flip of the sample decreases following an initial increase at the beginning;the antiferromagnetic property almost reaches zero;the magnetization decreases at the beginning but increases later on.The maximum magnetic entropy change and magnetic refrigeration effect RCP are reduced at varying degrees.Under a 7 T magnetic field,the maximum magnetic entropy change,△Smax,for the three samples of Tb1-xTmxFeO3 with x=0.00,0.15,0.25 is 13.78,-9.28,and 10.69 J/(K·kg),respectively;the magnetic refrigeration capacity(RCP) is 316.85,175.2,and 297.60 J/kg,respectively.In summary,doping with the element Tm reduces △Smax and RCP of the sample.Since the maximum magnetic entropy change and the cooling capacity for the three samples are relatively large,they can be used as an alternative for magnetic refrigerants.

关键词： Spin-flip Magnetic entropy change Magnetic refrigeration capacity magnetism Rare earths

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magnetism and work function of Ni-Cu alloys as metal gates

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Rare Metals 2012年第2期31卷 130-134页

作者： Cheng, Yanming Zheng, Yongping Huang, Xu Zhong, Kehua Chen, Zhigao Huang, Zhigao Department of Physics Fujian Normal University Fuzhou 350007 China

The magnetism and work function of pure Ni(001) and Ni-Cu slab alloys were investigated using first-principles methods based on density functional theory. The calculated results reveal that both magnetic moments and work functions of the alloys depend strongly on the surface orientation, but hardly on the distribution of doped Cu atoms for a given surface orientation. It is found that the doped Cu atoms have evident influence on the magnetic moment of Ni-Cu slabs, and the average magnetic moment of Ni atoms for Ni-Cu alloys decreases with increasing concentration of Cu atoms. Moreover, it is observed that the work function of Ni(001) is insensitive to the supercell thickness and the inner concentration of Cu atoms. In the meantime, the spin polarization is found to have an obvious role on the work function of the Ni-Cu alloys, which may give a new way to modulate the work function of the metal gate.

关键词： first principles magnetism work function

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