Magnetic behavior of rare earth intermetallic compounds
The rare earth intermetallic compounds are famous for their unconventional and technologically relevant magnetic properties. Predictive design of these materials requires comprehensive understanding of composition-structure-property relations, which opens possibilities for reliable manipulation of magnetic states by compositional tuning and external stimuli. Of note are non-equilibrium hysteresis phenomena, which may be either helpful (high performance permanent magnets) or harmful (solid state caloric cooling). This talk will highlight several families of rare earth magnetic materials, studied using a variety of experimental techniques such as temperature and magnetic field dependent X-ray powder diffraction, heat capacity, magnetization, and electrical transport properties. The goal is to connect basic science of these materials to their potential applications in solid state cooling and spintronics. Among the discussed systems are R5(Si,Ge)4 compounds (R – rare earth), where giant magnetocaloric effect was discovered by V. Pecharsky and K.A. Gschneidner, Jr. in 1997, R2In compounds, known for their anhysteretic magnetic first-order transformations, and magnetically compensated systems with strong exchange interactions but near zero magnetic moment, that are highly desired for spintronic applications.
This work was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Science and Engineering Division. The research was performed at Ames National Laboratory, which is operated for the U.S. DOE by Iowa State University under contract #DE-AC02-07CH11358.
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Yaroslav of Ames Laboratory, US Department of Energy
Magnetic behavior of rare earth intermetallic compounds
The rare earth intermetallic compounds are famous for their unconventional and technologically relevant magnetic properties. Predictive design of these materials requires comprehensive understanding of composition-structure-property relations, which opens possibilities for reliable manipulation of magnetic states by compositional tuning and external stimuli. Of note are non-equilibrium hysteresis phenomena, which may be either helpful (high performance permanent magnets) or harmful (solid state caloric cooling). This talk will highlight several families of rare earth magnetic materials, studied using a variety of experimental techniques such as temperature and magnetic field dependent X-ray powder diffraction, heat capacity, magnetization, and electrical transport properties. The goal is to connect basic science of these materials to their potential applications in solid state cooling and spintronics. Among the discussed systems are R5(Si,Ge)4 compounds (R – rare earth), where giant magnetocaloric effect was discovered by V. Pecharsky and K.A. Gschneidner, Jr. in 1997, R2In compounds, known for their anhysteretic magnetic first-order transformations, and magnetically compensated systems with strong exchange interactions but near zero magnetic moment, that are highly desired for spintronic applications.
This work was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Science and Engineering Division. The research was performed at Ames National Laboratory, which is operated for the U.S. DOE by Iowa State University under contract #DE-AC02-07CH11358.
Biography:
Yaroslav Mudryk received his M.S. degree in Chemistry (1997) and his Ph.D. in Inorganic Chemistry (2002) from Ivan Franko National University in Lviv, Ukraine. He joined Ames National Laboratory as a post-doctoral associate in 2004 and became a staff scientist at the laboratory in 2005. He is a group leader at the Division of Materials Science and Engineering and is involved in both basic and applied research. Yaroslav’s research, presented in nearly 200 peer-reviewed publications, aims to uncover how changes in composition and structure influence magnetic properties of rare earth-based intermetallic compounds. The areas of expertise include experimental synthesis and characterization of rare earth intermetallic alloys and compounds and science of coupled magnetic and structural solid-state transformations that respond strongly to temperature, pressure, and applied magnetic fields. Yaroslav is known for his work on materials for magnetic refrigeration. He also works on a one-step conversion of rare-earth oxides into hard magnetic materials under the umbrella of Critical Materials Innovation Hub.
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Address:Ames Laboratory, 254 Spedding Hall, 2416 Pammel Drive, Ames, United States, 50011