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Takuya Satoh, Ryugo Iida, Takuya Higuchi, Yasuhiro Fujii, Akitoshi Koreeda, Hiroaki Ueda, Tsutomu Shimura, Kazuo Kuroda, V I Butrim, B A Ivanov
Ultrafast control of magnets using femtosecond light pulses attracts interest regarding applications and fundamental physics of magnetism. Antiferromagnets are promising materials with magnon frequencies extending into the terahertz range. Visible or near-infrared light interacts mainly with the electronic orbital angular momentum. In many magnets, however, in particular with iron-group ions, the orbital momentum is almost quenched by the crystal field. Thus, the interaction of magnons with light is hampered, because it is only mediated by weak unquenching of the orbital momentum by spin-orbit interactions...
September 21, 2017: Nature Communications
C L Richardson, J M Devine-Stoneman, G Divitini, M E Vickers, C-Z Chang, M Amado, J S Moodera, J W A Robinson
We present a comprehensive study of the crystal structure of the thin-film, ferromagnetic topological insulator (Bi, Sb)2-x V x Te3. The dissipationless quantum anomalous Hall edge states it manifests are of particular interest for spintronics, as a natural spin filter or pure spin source, and as qubits for topological quantum computing. For ranges typically used in experiments, we investigate the effect of doping, substrate choice and film thickness on the (Bi, Sb)2Te3 unit cell using high-resolution X-ray diffractometry...
September 21, 2017: Scientific Reports
Imran Khan, Arqum Hashmi, M Umar Farooq, Jisang Hong
A few years ago, it was claimed that the two-dimensional (2D) feroxyhyte (δ-FeOOH) layer could possess a net magnetic moment and it could be applied for potential spintronics application because it showed a band gap. However, the exact crystal structure is still unknown. Hereby, we investigate the crystal structure, electronic band structure, magnetic and optical properties of 2D δ-FeOOH using density functional calculations. Based on the experimental observation and dynamical stability calculations, we propose that the 2D δ-FeOOH originates from a bulk Fe(OH)2 via oxidation...
September 20, 2017: ACS Applied Materials & Interfaces
Andrew Palii, Sergey Aldoshin, Boris Tsukerblat, Juan Modesto Clemente-Juan, Alejandro Gaita-Ariño, Eugenio Coronado
In this paper, we propose a toy model to describe the magnetic coupling between the localized spins mediated by the itinerant electron in partially delocalized mixed-valence (MV) systems. This minimal model takes into account the key interactions that are common for all such systems, namely, electron transfer in the valence-delocalized moiety and magnetic exchange between the localized spins and the delocalized electrons. The proposed descriptive model is exactly solvable which allows us to qualitatively and quantitatively discuss the main features of the whole class of partially delocalized MV systems...
September 20, 2017: Physical Chemistry Chemical Physics: PCCP
Mandar M Shirolkar, Jieni Li, Xiaolei Dong, Ming Li, Haiqian Wang
In recent years, BiFeO3 has attracted significant attention as an interesting multiferroic material in the exploration of fundamental science and development of novel applications. Our previous study (Phys. Chem. Chem. Phys.18, 2016, 25409) highlighted the interesting physicochemical features of BiFeO3 of sub-5 nm dimension. The study also accentuated the existence of weak ferroelectricity at sub-5 nm dimensions in BiFeO3. Based on this feature, we have prepared thin films using sub-5 nm BiFeO3 nanoparticles and explored various physicochemical properties of the thin film...
September 19, 2017: Physical Chemistry Chemical Physics: PCCP
Yu Chen, Qiang Sun
Based on first-principles calculations, we demonstrate that the recently-synthesized 2D organometallic framework consisting of Au atoms and 1,3,5-triethynylbenzene (Au-TEB) is a magnetic 2D organic topological insulator (OTI). The charge transfer and covalent bonding character lead to ferromagnetism and half-metallicity in the framework, and the weak spin-orbit coupling (SOC) of C pz orbitals mediated by Au d orbitals opens modest bandgaps in the vicinity of the Fermi level. Moreover, using tight-binding model simulations, we further characterize the nonzero Chern number and edge states of Au-TEB to confirm its topological nontriviality that remains intact when the framework is supported on an insulating substrate, and applying an external strain can increase the magnitude of SOC gaps, leading to an enhanced topological nontriviality...
September 14, 2017: Journal of Chemical Physics
Mingjia Zhang, Xiaoxiong Wang, Huijuan Sun, Ning Wang, Qing Lv, Weiwei Cui, Yunze Long, Changshui Huang
The new two-dimensional graphitic material, graphdiyne, has attracted great interest recently due to the superior intrinsic semiconductor properties. Here we investigate the magnetism of pure graphdiyne material and find it demonstrating a remarkable paramagnetic characteristic, which can be attributed to the appearance of special sp-hybridized carbon atoms. On this basis, we further introduce nitrogen with 5.29% N/C ratio into graphdiyne followed by simply annealing in a dopant source and realize a twofold enhancement of saturation moment at 2 K...
September 14, 2017: Scientific Reports
I Gross, W Akhtar, V Garcia, L J Martínez, S Chouaieb, K Garcia, C Carrétéro, A Barthélémy, P Appel, P Maletinsky, J-V Kim, J Y Chauleau, N Jaouen, M Viret, M Bibes, S Fusil, V Jacques
Although ferromagnets have many applications, their large magnetization and the resulting energy cost for switching magnetic moments bring into question their suitability for reliable low-power spintronic devices. Non-collinear antiferromagnetic systems do not suffer from this problem, and often have extra functionalities: non-collinear spin order may break space-inversion symmetry and thus allow electric-field control of magnetism, or may produce emergent spin-orbit effects that enable efficient spin-charge interconversion...
September 13, 2017: Nature
Yu-Xi Song, Wen-Yi Tong, Yu-Hao Shen, Shijing Gong, Z Tang, Chun-Gang Duan
Considerable progress in contemporary spintronics has been made in recent years for developing nanoscale data memory and quantum information processing. It is, however, still a great challenge to achieve the ultimate limit of storage bit. Two-dimensional materials, fortunately, provide an alternative solution to design materials with the expected miniaturizing scale, the chemical stability as well as the giant magnetic anisotropy energy. By performing first-principles calculations, we have examined two possible doping sites on WS<sub>2</sub> monolayer using three kind of transition metal (TM) atoms (Mn, Fe and Co)...
September 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Na Chen, Yingping Wang, Yuewen Mu, Yingfang Fan, Si-Dian Li
We performed a first-principles study on Fe-, Co-, and Ni-terminated zigzag phosphorene nanoribbons (ZPNRs) with different widths. Magnetic edges were observed for Fe- and Co-terminated ZPNRs, whereas Ni-terminated ZPNRs were nonmagnetic. Interestingly, magnetism could be induced in Ni-ZPNRs by external electric fields, and the distribution of the magnetic moments could be tuned by the direction of the electric fields. Furthermore, Fe-ZPNRs and Co-ZPNRs exhibit semi-metallic and metallic characteristics, respectively, whereas Ni-ZPNRs are mainly semiconductors with band gaps generally increasing monotonously with the increase in nanoribbon width...
September 13, 2017: Physical Chemistry Chemical Physics: PCCP
Konstantin L Ivanov, Alexander Wagenpfahl, Carsten Deibel, Jörg Matysik
Spin chemistry and spintronics developed independently and with different terminology. Until now, the interaction between the two fields has been very limited. In this review, we compile the two "languages" in an effort to enhance communication. We expect that knowledge of spin chemistry will accelerate progress in spintronics.
2017: Beilstein Journal of Nanotechnology
Martin Börner, Laura Blömer, Marcus Kischel, Peter Richter, Georgeta Salvan, Dietrich R T Zahn, Pablo F Siles, Maria E N Fuentes, Carlos C B Bufon, Daniel Grimm, Oliver G Schmidt, Daniel Breite, Bernd Abel, Berthold Kersting
The chemisorption of magnetically bistable transition metal complexes on planar surfaces has recently attracted increased scientific interest due to its potential application in various fields, including molecular spintronics. In this work, the synthesis of mixed-ligand complexes of the type [Ni(II)2L(L')](ClO4), where L represents a 24-membered macrocyclic hexaazadithiophenolate ligand and L' is a ω-mercapto-carboxylato ligand (L' = HS(CH2)5CO2(-) (6), HS(CH2)10CO2(-) (7), or HS(C6H4)2CO2(-) (8)), and their ability to adsorb on gold surfaces is reported...
2017: Beilstein Journal of Nanotechnology
Kun Zhai, Yan Wu, Shipeng Shen, Wei Tian, Huibo Cao, Yisheng Chai, Bryan C Chakoumakos, Dashan Shang, Liqin Yan, Fangwei Wang, Young Sun
Multiferroics materials, which exhibit coupled magnetic and ferroelectric properties, have attracted tremendous research interest because of their potential in constructing next-generation multifunctional devices. The application of single-phase multiferroics is currently limited by their usually small magnetoelectric effects. Here, we report the realization of giant magnetoelectric effects in a Y-type hexaferrite Ba0.4Sr1.6Mg2Fe12O22 single crystal, which exhibits record-breaking direct and converse magnetoelectric coefficients and a large electric-field-reversed magnetization...
September 12, 2017: Nature Communications
Christian B Schmidt, Shekhar Priyadarshi, Mark Bieler
The anomalous Hall (AH) and spin Hall effects are important tools for the generation, control, and detection of spin and spin-polarized currents in solids and, thus, hold promises for future spintronic applications. Despite tremendous work on these effects, their ultrafast dynamic response is still not well explored. Here, we induce ultrafast AH currents in a magnetically-biased semiconductor by optical femtosecond excitation at room temperature. The currents' dynamics are studied by detecting the simultaneously emitted THz radiation...
September 11, 2017: Scientific Reports
Seunghun Lee, Ji Hun Park, Bum-Su Kim, Deok-Yong Cho, Yong Nam Choi, Tae-Woo Lee, Won-Kyung Kim, Doukyun Kim, Chae Ryong Cho, Chikako Moriyoshi, Chul Hong Park, Yoshihiro Kuroiwa, Se-Young Jeong
Magnetic oxide semiconductors with wide band gaps have promising spintronic applications, especially in the case of magneto-optic devices. Co-doped ZnO (ZnCoO) has been considered for these applications, but the origin of its ferromagnetism has been controversial for several decades and no substantial progress for a practical application has been made to date. In this paper, we present direct evidence of hydrogen-mediated ferromagnetism and spin polarization in the conduction band of ZnCoO. Electron density mapping reveals the formation of Co-H-Co, in agreement with theoretical predictions...
September 11, 2017: Scientific Reports
X Z Chen, J F Feng, Z C Wang, J Zhang, X Y Zhong, C Song, L Jin, B Zhang, F Li, M Jiang, Y Z Tan, X J Zhou, G Y Shi, X F Zhou, X D Han, S C Mao, Y H Chen, X F Han, F Pan
The independent control of two magnetic electrodes and spin-coherent transport in magnetic tunnel junctions are strictly required for tunneling magnetoresistance, while junctions with only one ferromagnetic electrode exhibit tunneling anisotropic magnetoresistance dependent on the anisotropic density of states with no room temperature performance so far. Here, we report an alternative approach to obtaining tunneling anisotropic magnetoresistance in α'-FeRh-based junctions driven by the magnetic phase transition of α'-FeRh and resultantly large variation of the density of states in the vicinity of MgO tunneling barrier, referred to as phase transition tunneling anisotropic magnetoresistance...
September 6, 2017: Nature Communications
Guanhua Qin, Wei Wu, Shunbo Hu, Yongxue Tao, Xiaoyan Yan, Chao Jing, Xi Li, Hui Gu, Shixun Cao, Wei Ren
Heusler alloys crystallize in a close-packed cubic structure, having a four-atom basis forming a face-centred cubic lattice. By selecting different composite elements, Heusler alloys provide a large family of members for frontier research of spintronics and magnetic materials and devices. In this paper, the structural, electronic and magnetic properties of a novel quaternary Heusler alloy, PdMnTiAl, have been investigated using a first-principles computational materials calculation. It was found that the stable ordered structure is a non-magnetic Y-type1, in good agreement with the Slater-Pauling rule...
July 1, 2017: IUCrJ
Colette Boskovic
Longstanding and important applications make use of the chemical and physical properties of both rare earth metals and polyoxometalates of early transition metals. The catalytic, optical, and magnetic features of rare earth metal ions are well-known, as are the reversible multielectron redox and photoredox capabilities of polyoxomolybdates and polyoxotungstates. The combination of rare earth ions and polyoxometalates in discrete molecules and coordination polymers is of interest for the unique combination of chemical and physical properties that can arise...
September 5, 2017: Accounts of Chemical Research
Jingjing Lu, Mei Guo, Jinkui Tang
Single-molecule magnets (SMMs) exhibiting slow relaxation of magnetization of purely molecular origin are highly attractive owing to their potential applications in spintronic devices, high-density information storage and quantum computing. Particularly, lanthanide SMMs have been playing a major role in the advancement of this field because of the large intrinsic magnetic anisotropy of lanthanide metal ions. In this Focus Review, some recent breakthroughs that are changing the perspective of the field will be highlighted with special emphasis on the synthetic strategies towards the design of high-performance SMMs...
September 1, 2017: Chemistry, An Asian Journal
Yun Tong, Yuqiao Guo, Kejun Mu, Huan Shan, Jun Dai, Yi Liu, Zhe Sun, Aidi Zhao, Xiao Cheng Zeng, Changzheng Wu, Yi Xie
Two-dimensional transition metal dichalcogenides (TMDs) have been regarded as one of the best nonartificial low-dimensional building blocks for developing spintronic nanodevices. However, the lack of spin polarization in the vicinity of the Fermi surface and local magnetic moment in pristine TMDs has greatly hampered the exploitation of magnetotransport properties. Herein, a half-metallic structure of TMDs is successfully developed by a simple chemical defect-engineering strategy. Dual native defects decorate titanium diselenides with the coexistence of metal-Ti-atom incorporation and Se-anion defects, resulting in a high-spin-polarized current and local magnetic moment of 2D Ti-based TMDs toward half-metallic room-temperature ferromagnetism character...
September 1, 2017: Advanced Materials
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