A novel method for controlling nanowire magnetic properties and growth from filling time profile is presented.
The wires are grown with an electrodeposition method ("Template synthesis") with a wide selection of pore diameters. We show that stray-fields presence in ferromagnetic nanowires are entirely dependent on the nanowire diameter. Besides a crossover effect in the reversal mechanism is observed with change in diameter. In this work, theory and experiment agree and confirm that according to the variety of hysteresis loop measured, about four ranges of values of pore diameter control the orientation of nanowire magnetization easy axis with respect to the geometrical axis.
We have systematically studied the evolution of magnetic properties, especially the coercivity and the remanence ratio in the vicinity of the Verwey transition temperature (TV ), of high-quality epitaxial Fe3O4 thin films grown on MgO (001), MgAl2O4 (MAO) (001), and SrTiO3 (STO) (001) substrates. We observed rapid change of magnetization, coercivity, and remanence ratio at TV , which are consistent with the behaviors of resistivity versus temperature [\r{ho}(T )] curves for the different thin films. In particular, we found quite different magnetic behaviors for the thin films onMgOfrom those o…
High coercivity induced by mechanical milling in cobalt ferrite powders
在这项工作中，我们报告的研究亚铁磁性氧化物CoFe 2 O 4的磁行为处理的机械研磨与不同的磨球。采用简单的水热法制备了钴铁氧体纳米粒子，并在500 ℃下进行了退火处理。未研磨的样品呈现约1.9kOe的磁化率、69.5emu/g的饱和磁化强度和0.42的剩磁比。球磨后，两种样品的磁化强度分别为4.2和4.1kOe，饱和磁化强度分别为67.0和71.4emu/g。这些样品的剩磁比MR/MS分别增加到0.49和0.51。为了研究这些样品的磁行为的微观结构的影响，我们使用X射线粉末衍射（XPD），透射电子显微镜（TEM），和振动样品磁强计（VSM）。通过Williamson-Hall图的XPD分析用于估计样品中由机械研磨引起的平均微晶尺寸和应变。
Coercivity weighted Langevin magnetisation; A new approach to interpret superparamagnetic and nonsuperparamagnetic behaviour in single domain magnetic nanoparticles
The development of permanent magnets containing less or no rare-earth elements is linked to profound knowledge of the coercivity mechanism. Prerequisites for a promising permanent magnet material are a high spontaneous magnetization and a sufficiently high magnetic anisotropy. In addition to the intrinsic magnetic properties the microstructure of the magnet plays a significant role in establishing coercivity. The influence of the microstructure on coercivity, remanence, and energy density product can be understood by {using} micromagnetic simulations. With advances in computer hardware and num…
Electrical iron silicon steel is the most commonly used soft magnetic material in electrical energy conversion and transmission, and its demand is expected to increase with the need for electrification of the transportation sector and the transition to renewable energy to combat climate change. Although iron silicon steel has been used for more than 100 years, some fundamental relationships between microstructure and magnetic performance remain vague, especially with regard to the role of crystal defects such as grain boundaries and dislocations that are induced during the final cutting step o…
The crystallization and magnetic behavior of yttrium iron garnet (YIG) prepared by metallo-organic decomposition (MOD) method are discussed. The chemistry and physics related to synthesis of iron and yttrium carboxylates based on 2-ethylhexanoic acid (2EHA) are studied, since no literature was found which elucidates synthesis of metallo-organic precursor of YIG in spite of the literatures of doped YIG samples such as Bi-YIG. Typically, the metal carboxylates used in preparation of ceramic oxide materials are 2-ethylhexanoate (2EH) solvents. Herein, the synthesis, thermal behavior and solubilit…
Interplay between Exchange Interaction and Magnetic Shape Anisotropy of ferromagnetic nanoparticles in a non-magnetic matrix for rare-earth-free permanent magnets
Polymer-bonded magnets produced by laser powder bed fusion: Influence of powder morphology, filler fraction and energy input on the magnetic and mechanical properties
A study of dynamic and reversible voltage controlled magnetization switching in ferromagnetic Co/Pt thin film with perpendicular magnetic anisotropy at room temperature is presented. The change in the magnetic properties of the system is observed in a relatively thick film of 15 nm. A surface charge is induced by the formation of electrochemical double layer between the metallic thin film and non-aqueous lithium LiClO4 electrolyte to manipulate the magnetism. The change in the magnetic properties occurred by the application of an external electric field. As the negative voltage was increased, …
Dynamic phase transition properties and hysteretic behavior of a ferrimagnetic core-shell nanoparticle in the presence of a time dependent magnetic field
Magnetic, Optoelectronic, and Rietveld refined structural properties of Al3+ substituted nanocrystalline Ni-Cu spinel ferrites: An experimental and DFT based study
Impact of the lead factor of neutron irradiation on the magnetic properties of RPV steels
Comisión Nacional de Energía Atómica（国家原子能委员会）；Universidad Tecnológica Nacional（国立技术大学）；Universidad Nacional de Cuyo, Instituto Balseiro（门多萨国立大学，巴尔塞罗研究所）
Decoupling size from magnetism: A length-scale boundary for curvature control in micrometer FePt Janus particles
Institute for Materials Science, University of Stuttgart（斯图加特大学材料科学研究所）；Materials Central Scientific Facility, Max Planck Institute for Intelligent Systems (MPI-IS)（马克斯·普朗克智能系统研究所材料中央科学设施）；Max Planck Institute for Solid State Research（马克斯·普朗克固相研究所）
