Nanomagnetic Materials Design and Characterization of High Energy Product Permanent Magnet
Abstract
With fast-growing demands in electrical propulsion, power and energy resilience technologies, search for cheaper and widely availabl,e permanent magnets with high saturation magnetization, high uniaxial magnetocrystalline anisotropy, and high Curie temperature beco,mes ever so important. This undertaking is even more urgent for subsea power conversion, naval energy resilience, and electrical sys,tems that support naval warfighting technologies. Today?s search focuses exclusively on reducing the content of the expensive rare-e,arth and heavy metals in high-performance, thermally stable permanent magnets. Project Objectives: The ultimate goal of this proposa,l is to search for novel, inexpensive nanomagnetic materials through a high throughput computational investigations supplemented by,materials fabrication and characterization experiments. The objective is obtaining of compositional and structural design informatio,n for rare-earth free/reduced high performance permanent magnets. Project Deliverables: This project will provide extensive i,nformation on compositional and structural landscape of new thermally stable, high-performance permanent magnets with high satura,tion magnetization and uniaxial magnetocrystalline anisotropy, thus large energy product, and high Curie temperature, that are based, on transition metals with none or reduced rare-earth content. Project Scientific Impact: This effort will reduce existing knowledg,e gaps in atomistic under-standing of rare-earth free/reduced permanent magnets and improve physical insights into the mechanisms of, high-performance, low-cost permanent magnetic materials.Project Wider Impact: This project will fund 4 PhD-level graduate students,and 3 postdoctoral fellow researchers at full time. At least two graduate students will graduate completing their thesis on the rese,arch conducted during this project. In addition, one full-time contractor will be employed to maintain computational and experimenta,l facilities, and one full-time project manager for logistics and administrative hurdles, annual project review meetings, and outrea,ch activities. Project Concept: We aim to pursue a novel strategy, in which the intrinsic and extrinsic hard magnetic properties of, iron-based Sm?Fe?M?N (M = 3d and 3p metals; N = B, C, N, and O), Fe?Ni?M?N, and Fe?Co?M?N compounds at elevated temperatures will b,e investigated computationally, while systematically sampling their compositional and structural variances. This effort will use qu,antum computational research tools based on the Density Functional Theory to calculate lattice, thermodynamic energetics, electronic, and magnetic structures. Monte Carlo simulation methods will be employed to calculate finite temperature properties Curie temperatu,re, hysteresis loop curve, and maximum energy density product. Insights gained from the computational calculations will then in,form the fabrication and characterization of the candidate alloys. Fabrications will employ induction melting and che,mical synthesis methods, while characterizations will use X-ray diffraction, X-ray fluorescence, field emission scanning electron,microscope, and scanning transmission electron microscopy. Temperature dependent magnetic properties will be measured using the sup,erconducting quantum interference device magnetometer.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Oct 07, 2022
- Source ID
- N629092212045
Entities
People
- Namsrai Tsogbadrakh
Organizations
- National University of Mongolia
- Office of Naval Research
- United States Navy