Here we report the optimized magneto-transport properties of polycrystalline La0.70Ca0.3-xSrxMnO3 and their composites with Ag. The optimization was carried out by varying the Sr and Ag contents simultaneously to achieve large temperature coefficient of resistance (TCR) as well as low field magneto-resistance (MR) at room temperature. Sharpest paramagnetic (PM)-ferromagnetic (FM) and insulator-metal (IM) transition is observed in the vicinity of the room temperature (TC=300 K=TIM) for the composition La0.70Ca0.20Sr00.10MnO3:Ag0.20. Partial substitution of larger Sr2+ ions at the Ca2+ ions sites controls the magnitude of the FM and IM transition temperatures, while the Ag induces the desired sharpness in these transitions. For the optimized composition, maximum TCR and MR are tuned to room temperature (300 K) with the former being as high as 9% and the later being 20 and 30 percent at 5 and 10 kOe magnetic fields respectively. Such sharp single peak (TCR= 9 percent) at room temperature can be used for the bolometric and infrared detector applications. The achievement of large TCR and low field MR at T~300K in polycrystalline samples is encouraging and we believe that further improvements can be achieved in thin films, which, by virtue of their low conduction noise, are more suitable for device applications.
Anomalous magnetotransport in a non-collinear correlated kagome ferromagnet MgMn6Sn6
S. N. Bose National Centre for Basic Sciences（S.N. 玻色基础科学国家中心）；Max Planck Institute for Chemical Physics of Solids（马克斯·普朗克固体化学物理研究所）；ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory（ISIS中子与μ子源，科学与技术设施委员会，拉瑟福德阿普尔顿实验室）；School of Physical Sciences, Indian Institute of Technology Goa（印度果阿理工学院物理科学学院）
Room temperature intrinsic anomalous Hall effect in disordered half-metallic ferromagnetic quaternary Heusler alloy CoRuFeSi
National Institute of Technology Andhra Pradesh（安得拉邦国立技术学院）；Indian Institute of Technology Hyderabad（海德拉巴印度理工学院）；Institute of Low Temperature and Structure Research, Polish Academy of Sciences（波兰科学院低温结构研究所）；Indian Institute of Technology Kanpur（坎普尔印度理工学院）；UGC-DAE Consortium for Scientific Research, Kolkata Centre（UGC-DAE科学研究中心加尔各答中心）
Enhanced Curie temperature and room-temperature 50-nm skyrmions achieved in hexagonal ferromagnet Mn5Ge3+x synthesized via a high-pressure method
Anhui University（安徽大学）；Institutes of Physical Science and Information Technology, Anhui University（安徽大学物理科学与信息技朮研究所）；High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences（中国科学院合肥物质科学研究院强磁场科学中心）；Hefei Normal University（合肥师范学院）
Magnetoresistance in Fe$_{1-x}$Ga$_x$ thin films presenting striped magnetic pattern: the role of closure domains and domain walls
在这项工作中，我们显示存在的闭合域的Fe $_{1-x}$ Ga $_x$薄膜具有条纹的磁性图案和研究的效果的磁畴安排上的磁输运性质。通过X射线共振磁散射，我们实验证明了这种封闭域的存在，并估计其大小和相对贡献的表面磁化。磁输运实验表明，磁电阻的行为依赖于测量的几何形状，以及对温度。当电流垂直于条带方向流动时，沿条带方向施加磁场，在所研究的温度范围内，电阻率都降低（负磁阻），计算表明各向异性磁阻是主要的来源。在电流平行于条畴流动的情况下，磁阻改变符号，在室温下为正，在100 K下为负。为了解释这种行为，除了各向异性的贡献外，还必须考虑磁畴壁对磁阻的贡献。
Macroscopic evidence of spatial modulation of conductivity in a microtextured ferromagnetic film
Instituto de Ciencias Físicas (ICIFI, UNSAM-CONICET)（物理科学研究所）；Instituto de Nanociencia y Nanotecnología, INN (CNEA-CONICET). Centro Atómico Bariloche（纳米科学与技术研究所，INN（CNEA-CONICET）。巴里洛切原子中心）；Instituto Balseiro, UNCuyo-CNEA（巴尔塞罗研究所）；UNRN, Sede Andina（内乌肯国立大学，安第斯校区）；Instituto de Nanociencia y Nanotecnología, INN (CNEA-CONICET). Centro Atómico Constituyentes（纳米科学与技术研究所，INN（CNEA-CONICET）。宪法者原子中心）
