Theory Guided High Performance Permanent Magnets: From Ferrites to Neo
Durga Paudyal, Staff Scientist, Ames Laboratory

The development and deployment of permanent magnets depends on the utilization of suitable magnetic and bonding elements in the anisotropic crystal structures. Theory helps pinpoint which atoms in the structure provide intrinsic permanent magnet properties (magnetization, ferromagnetic transition temperature, and magnetic anisotropy) essential for permanent magnet performance and which atoms can be substituted to lower the usage of critical elements. Additionally, micro-magnetic theory helps to predict extrinsic properties via micro-structure evolution for the development of coercivity, which is another crucial component for permanent magnet performance. This session will provide a few examples of how theory guided the discovery, development, and commercialization of site substituted hexaferrite to rare-earth cobalt to neo magnets applicable in vehicle, wind turbine, and other house hold technologies.

Durga Paudyal is a staff scientist at Ames Laboratory and an adjunct associate professor at Iowa State University. Formerly, he was a postdoctoral research associate and an assistant scientist at the same lab. He joined the lab in December 2004. His research experience is in the field of rare earth magnetism, including permanent magnets, magnetocaloric effect, quantum materials, and quantum information science. He has more than 90 publications in reputed journals and has given more than 35 invited presentations and panel discussions for various conferences, and reviewed more than 200 research papers for high impact journals; he has been the principal investigator for various projects at the Ames Laboratory. Paudyal is an editorial board member for Frontiers of Quantum Materials and Materials Science and a regular member of the American Physical Society. He has also organized workshops and symposia and he was recently a program committee member for Intermag-2020. He received his Ph.D. in Theoretical and Computational Materials Physics in 2005.

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