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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Materials Science for High-Performance Permanent Magnets
Presentation Title Electronic States of Rare Earth Elements in Permanent Magnet Materials Probed by X-ray Magnetic Circular Dichroism Nano-Spectroscopy
Author(s) Tetsuro Ueno, Ai Hashimoto, Yasuo Takeichi, Kanta Ono
On-Site Speaker (Planned) Tetsuro Ueno
Abstract Scope Electronic state of 4<I>f</I> electrons of rare earth elements plays a crucial role in determining magnetic properties of rare-earth permanent magnet materials. In this study, we applied one of the most relevant X-ray technique, X-ray magnetic circular dichroism (XMCD) nano-spectroscopy using a scanning transmission X-ray microscope, to investigate 4<I>f</I> electronic states of various permanent magnet compounds. Highly focused X-rays enable us to probe tiny samples whose size of several micrometers square. Therefore, we can perform detailed spectroscopic analysis of single crystalline uniform samples extracted from polycrystalline bulk or powder-formed samples such as Sm<SUB>2</SUB>Fe<SUB>17</SUB>N<SUB>3</SUB>. Single crystalline samples were picked-up from actual magnets by microfabrication. X-ray absorption spectra and XMCD spectra were measured at the <I>M</I><SUB>4,5</SUB> edges of Sm for SmCo<SUB>5</SUB>, Sm<SUB>2</SUB>Fe<SUB>17</SUB>N<SUB>3</SUB>, Nd for Nd<SUB>2</SUB>Fe<SUB>14</SUB>B, NdFe<SUB>11</SUB>Ti, and Dy for (Nd,Dy)<SUB>2</SUB>Fe<SUB>14</SUB>B. Magnetic moments and valence states of rare earth elements will be compared among these compounds.
Proceedings Inclusion? Undecided


Ab-initio Study of Transition-metal-doping Effects on the Magnetic Anisotropy in Nd-Fe- B Sintered Magnets
Analyses on Magnetization Reversal Process of Nd-Fe-B Hot-deformed Magnets
Bulk High-throughput Experimentation to Discover New Hard Magnets
Coercivity and Strength Enhancement of a Binder Jetted NdFeB Bonded Magnet by (Pr,Nd)-Cu-Co Alloy Infiltration
Coercivity Enhancement of Hot-deformed NdFeB Magnets by GBDP with NdHx and Metallic Nanoparticles
Data-driven Approach for Magnetic Neutron Scattering Data Analysis of Permanent Magnets Using Statistical Learning and Artificial Intelligence
Demagnetizing Fields and Magnetization Reversal in Permanent Magnets
Electrical Resistivity Enhancement by Doping with Eutectic DyF3–LiF Salt Mixture in Nd-Fe-B Die-upset Magnet
Electronic States of Rare Earth Elements in Permanent Magnet Materials Probed by X-ray Magnetic Circular Dichroism Nano-Spectroscopy
Fabrication of Nd-Fe-B Thin Films as a Model Material
Fabrication of Submicrometer-sized Sm2Fe17N3 Hard Magnetic Particles
First-principles Study of ThMn12-type Iron-based Rare-earth Intermetallics
Grain Boundary Diffusion of Co, Cu and Nb as Function of Temperature in NdFeB
Grain Boundary Diffusion of Different Rare Earth Elements in Nd-Fe-B Sintered Magnets by Experiment and FEM Simulation
Grain Size Refinement of Ga-doped Nd-Fe-B Magnet
High-coercivity Dy-free Nd-Fe-B Permanent Magnets
High Magnetic Field Processing of Melt-spun Permanent Magnet Alloys
Imaging the Changes in Magnetic Domain Structure in Nd-Fe-B Sintered Magnets throughout the Demagnetisation Process by Soft X-ray Magnetic Circular Dichroism Microscopy
L10-FeNi Films with Coercivity in Excess of 1 kOe: A Combinatorial Sputtering Approach
Large-scale Micromagnetics Simulation for Initial Magnetization Process in Nd-Fe-B Hot-deformed Nanocrystalline Magnet
Magnetic Anisotropy and Crystallographic Alignment in d-HDDR Process of Nd-Fe-B-Ga-Nb Powders
Magnetic Anisotropy of Epitaxially Grown L10 Mn-(Ga,Al) Alloy Thin Films
Magnetic Anistropy and Microstructure Interplay in Fe16N2 Based Permanent Magnets
Microstructural Characterization of Magnetic MnAl Alloys
Microstructural Engineering of Nd-Fe-B Permanent Magnets with Significantly Reduced Dy
Microstructure and Coercivity in Ultra-fine Grained Nd-Fe-B Sintered Magnets
Microstructure Formation of Strip-cast R-Fe-B Alloys for Magnets
New Hard Magnetic ThMn12-type phases with Low Rare Earth Contents for Permanent Magnet Applications
Phase Equilibria in the Nd-based Permanent Magnets
Powder-processed High-performance Alnico Magnets by Thermal Gradient Control
Prospects for Advanced Manufacturing of Magnets
Quantifying the True Enhancement in Coercivity by Dy Diffusion into Sintered Nd-Fe-B Alloys
Recent Developments in High Coercivity Nd-lean Nd-Fe-B Infiltrated Magnets
Recent Developments in RFe12-type Compounds for Permanent Magnets
Reduced Cobalt Energy Efficient “Green” Alnico
Search for New Rare-earth-free Hard Magnetic Materials Using Solution Growth
Search for Substitutes of Magnetic Materials Containing Critical Elements by High-throughput Screening and Multi-scale Modeling Approaches
Stability Origin of Binary Systems Relevant to Multi-component Phase in Nd-Fe-B
Structural Evolution in Alnico -- A Transmission Electron Microscopy and Atom Probe Tomography Study
Structure and Magnetic Properties of Fe3Sn1-xMx (M=Sb, P)
Synthesis and Processing of Hard Iron Oxide Nanocomposites for Rare Earth Free Permanent Magnets
Tailoring the Coercive Field of Grain Boundary Engineered Magnets: A Nanoanalytical TEM and Micromagnetic Simulation Study
Temperature Dependence of the Magnetization and Magnetic Anisotropy Measured on the Epitaxial RFe12 (-Nx) (R = Sm and Nd) Thin Films with ThMn12 Structure
Temperature Dependence of Threshold of Magnetic Fields for Nucleation and Domain Wall Propagation
Texture Development Mechanism in HDDR Processed Nd-Fe-B Magnet
The Current State and Future of the Rare Earth Magnets
Theoretical Study on Atomic Structures and Coercivity in Nd-Fe-B Magnets
Theoretical Study on the Temperature Dependence of Magnetic Anisotropy Constants of Rare Earth Permanent Magnets
Towards High-performance Permanent Magnets without Rare Earths

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