Extraordinary Responsive Rare Earth Magnetic Materials

Personnel

Project Leader(s):
Vitalij Pecharsky

Principal Investigators:
Scott Chumbley, Karl Gschneidner, Jr., Gordon Miller, Vitalij Pecharsky

Postdoctoral Research Associates:
Mahmud Khan, Hui Wang, Junding Zou

Overview

A major goal of this research is to uncover the underlying electronic, atomic and microscopic interactions that result in an extraordinarily strong coupling between the magnetic and crystal lattices and remarkable responsiveness to both strong (temperature and pressure) and weak (magnetic field) stimuli in some rare earth intermetallic materials. It will be achieved by focusing on the state-of-the-art synthesis, processing and characterization, combined with theory, modeling and computations gauged and refined against reliable experimental data.

The following systems have been selected as model candidates: GdNi and other equiatomic RM compounds (R is a rare earth metal and M is a 3d transition metal or a main Group 14 element), RCo2, La(Fe1‑xSix)13 and hydrides La(Fe1‑xSix)13Hy, and R5T4 compounds (T is a main Group 14 element). These materials exhibit a number of diverse and unique properties associated with magnetic ordering alone, magneto-volume, itinerant electron metamagnetic, and magnetic-martensitic transformations, respectively, which may or may not be driven by a reversible breaking and reforming of specific chemical bonds.

Development and validation of phenomenological models of transformations that range from magneto-volume to magnetic-martensitic is another goal, thus guiding future discoveries of material systems exhibiting strong reactions to small changes of magnetic field, with temperature and pressure providing additional sources of stimulation.

Highlights

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Publications

2011
Fu H; Zou M . 2011. Magnetic and magnetocaloric properties of ternary Gd-Co-Al bulk metallic glasses. Journal of Alloys and Compounds. 509:4613-4616. abstract
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Tseng Y C; Ma H J; Yang C Y; Mudryk Y; Pecharsky V K; Gschneidner K A; Souza-Neto N M; Haskel D . 2011. Effect of Si doping and applied pressure upon magnetostructural properties of Tb-5(SixGe1-x)(4) magnetocaloric compounds. Physical Review B. 83:104419 . abstract
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Zhang H; Long Y; Cao Q; Zou M; Gschneidner K A; Pecharsky V K . 2011. Effect of Ca on the microstructure and magnetocaloric effects in the La1-xCaxFe11.5Si1.5 compounds. Journal of Alloys and Compounds. 509:3746-3750. abstract
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Gschneidner K . 2011. A rare opportunity beckons. Physics World. 24:17-17. abstract
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Lyubina J; Kuz'min M D; Nenkov K; Gutfleisch O; Richter M; Schlagel D L; Lograsso T A; Gschneidner K A . 2011. Magnetic field dependence of the maximum magnetic entropy change. Physical Review B. 83:012403. abstract
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2010
Khan M; Mudryk Y; Paudyal D; Gschneidner K A; Pecharsky V K . 2010. Experimental and theoretical study of the magnetic and structural properties of Er0.75Tb0.25Al2. Physical Review B. 82:064421. abstract
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Haldar A; Singh N K; Suresh K G; Nigam A K . 2010. Metastable magnetization behavior of magnetocaloric R6Co1.67Si3 (R=Tb and Nd) compounds. Physica B-Condensed Matter. 405:3446-3451. abstract
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Fu H; Zou M; Singh N K . 2010. Modification of magnetic and magnetocaloric properties of Dy-Co-Al bulk metallic glass introduced by hydrogen. Applied Physics Letters. 97:262509. abstract
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Ryan D H; Cadogan J M; Cranswick L M D; Gschneidner K A; Pecharsky V K; Mudryk Y . 2010. Structural and magnetic transitions in Gd5SixGe4-x (0 <= x <= 0.9) from neutron powder diffraction. Physical Review B. 82:224405. abstract
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Paudyal D; Mudryk Y; Pecharsky V K; Gschneidner K A . 2010. Competing crystal and magnetic structures in Gd5Ge4. Physical Review B. 82:144413. abstract
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