Advances in Magnetic Materials: Magnetoelastic and Magnetocaloric Materials
Sponsored by: TMS Functional Materials Division, TMS: Magnetic Materials Committee
Program Organizers: Jose Maria Porro, BCMaterials; Huseyin Ucar, California Polytechnic University,Pomona; Patrick Shamberger, Texas A&M University; Min Zou, Lab Magnetics, A Quadrant Company; Gaoyuan Ouyang, Ames Laboratory; Alex Leary, NASA Glenn Research Center
Monday 2:00 PM
March 20, 2023
Room: 33A
Location: SDCC
Session Chair: Jose Maria Porro, BCMaterials & Ikerbasque
2:00 PM Invited
Magnetovolume Effects in Metamagnetic Shape Memory Heusler Compounds: Patricia Lazpita1; Victor L'vov2; Jesús Rodríguez Fernández3; Jose Manuel Barandiarán1; Volodymyr Chernenko4; 1University of Basque Country; 2Taras Shevchenko National University; 3University of Cantabria; 4Ikerbasque, Basque Foundation for Science
Heusler metamagnetic shape memory compounds (MMSMAs) show a large functional response related to a first order martensitic transformation (MT). The strong magnetostructural coupling together with mixed magnetic interactions (ferromagnetic, antiferromagnetic or paramagnetic) enable controlling the MT by means of magnetic field resulting in different multifunctional properties such as giant magnetoresistance, MMSM effect, or inverse magnetocaloric effect. The shift rate of MT as a function of the magnetic field, external stresses or their combination is a key parameter for the development of these effects.In this work, we review our last work on these alloys, where we analyze the effect of both, the hydrostatic pressure and the uniaxial compressive stress, together with the magnetic field on the MT for NiMnIn and MnNiSnFe MMSMAs. The role of the magnetovolume coupling and the magnetic nature of the different phases in the MT is explained in the framework of the thermodynamic theory.
2:30 PM
Fe-doping Influence on the Magnetostrictive Behaviour of Ni–Mn–Ga–Co–In–Fe Magnetic Shape Memory Alloys: Natalia Rio Lopez1; Patricia Lázpita2; Fernando Plazaola2; Volodymyr Chernenko3; Jose María Porro1; 1BCMaterials; 2University of the Basque Country; 3Ikerbasque
Ni-Mn-based magnetic shape memory alloys (MSMAs) are active materials that undergo martensitic transformations induced by temperature, stress and/or magnetic fields, leading to large recoverable mechanical transformations. As a result of the strong magnetoelastic coupling they show, these alloys can present large magnetostrains, due to either a reorientation of martensitic twin-variants or a magnetic-field induced martensitic transformation. NiMnGaCo-based alloys present a metamagnetic behaviour in their martensite phase, where stoichiometry controls the critical temperatures: structural, Tm, and magnetic, Tc. It is well assessed that the cyclability of the magnetostriction depends on the hysteretic character (sharpness and temperature) of the structural transformation. In this work, Ni-Co-Mn-Ga-In alloys were doped with Fe to analyse its effect on the hysteresis of the martensitic transformation (MT). Trends in the MT, Curie temperatures, as well as in the magnetization change across the MT, will be discussed in a series of Ni-Mn-Ga-Co-In-Fe (%At Fe = 0-5) meta-MSMAs.
2:50 PM Invited
The Search in the Vast High-entropy Alloy Space for Competitive Magnetocaloric Properties: Jia Yan Law1; Álvaro Díaz-García1; Luis M. Moreno-Ramírez1; Victorino Franco1; 1Sevilla University
The magnetocaloric effect (MCE) of high-entropy alloys (HEAs) was, until recently, restricted to low-temperatures or giving sub-par performance. Compositions diluted the moment of ferromagnetic elements (including rare-earth (RE) elements), resembling “too many cooks spoil the broth”. Extending to the second-generation HEAs beyond the equiatomic point towards non-equiatomic HEA region, a directed search strategy yields a ≥ 5-fold MCE performance enhancement without RE reliance. In this talk, we will overview the design strategy of magnetocaloric HEAs that allowed to obtain this remarkable enhancement, closing the gap between HEAs and conventional MCE materials. Supported by Grant PID2019-105720RB-I00 funded by MCIN/AEI/10.13039/501100011033 and US Air Force Office of Scientific Research (FA8655-21-1-7044). [1] J. Y. Law, V. Franco, “Pushing the limits of magnetocaloric high entropy alloys”, APL Materials 9, 080702 (2021). [2] J.Y. Law, et al., Acta Materialia 212, 116931 (2021).[3] J.Y. Law, et al., Journal of Alloys and Compounds 855, 157424 (2021).
3:20 PM
Mechanochemical Synthesis of Magnetostrictive Materials: Ce-doped Galfenol and Alfenol: Alexander Baker1; Alfred Amon1; Jibril Shittu1; Hunter Henderson1; Emily Moore1; Scott McCall1; 1Lawrence Livermore National Laboratory
Magnetostrictive materials such as FeGa (Galfenol) and FeAl (Alfenol) provide high precision solid-state sensing capabilities, with applications in magnetic field sensing, load cells, or tunable inductor circuits. The magnetostrictive effect can be enhanced through addition of rare earths such as Ce, but CeGa2 formation above ~0.01 at. % Ce limits these gains. Here we present a combination of nonequlibrium methods, mechanical alloying and laser powder bed fusion, that circumvent this limitation and allow greater design flexibility than bulk processing. We find that the mechanical alloying allows up to 0.5 at. % Ce addition without CeGa2 formation, resulting powders are amenable to pressing and sintering to near-full density, and usable as feedstock for additive manufacturing. A comprehensive study of doping and fabrication parameters will be presented, focusing on phase formation and its effects on magnetostriction, as well as opportunities presented by near-net shape fabrication. Prepared by LLNL under Contract DE-AC52-07NA2
3:40 PM Break
3:55 PM Invited
Magnetoelastic Resonance Sensors: The Importance of Their Geometry on the Most Recent Applications: Paula G.Saiz1; Roberto Fernández-de-Luis1; Andoni Lasheras2; José M. Porro1; José Luis Vilas-Vilela2; Ana Catarina Lopes2; 1BCMaterials; 2University of Basque Country
Magnetoelastic resonantors are gaining attention as an incredible versatile and sensitive transduction platform for the detection of varied physical and biological parameters. They are particularly interesting due to their low cost and wireless detection process. Over the years, several parameters have been optimized to improve their performance, such as their composition, surface functionalization and, more recently, their geometry. Our group has demonstrated both theoretically and experimentally, that mass load sensitivity can be improved by tailoring sensor geometry and mass load position. Triangular and rhombus shaped platforms, among other, have been tested and compared with the traditional rectangular ones. Furthermore, a study of the dependence of magnetic microstructure with the geometry of the magnetic resonator was performed by means of MOKE microscopy. Finally, real sensors systems were developed, showing the key role of magnetoelastic platform geometries in the draw of future labor-free and wireless sensors.
4:25 PM
Rhombic Magnetoelastic Sensors with MOF Active Layers: A Potential Tool for Wireless VOCs Detection: Paula Gonzalez1; Roberto Fernandez2; Maria Isabel Arriortua2; Ana Catarina Lopes3; 1Knight Campus; 2BCMaterials; 3UPV/EHU
Magnetoelastic sensors are becoming an interesting sensing technology because, besides exhibiting a fast response and be very cheap, they present a wireless sensing capacity. Despite their potentials, the improve of their sensitivity and selectivity is a key. This work explores the functionalization of magnetoelastic resonators with porous MOFs active layers to endows them with high adsorption capacity and selectivity. Different MOF materials and different functionalizations process are explored. In particular, the performance of a rhombic resonator functionalized with a high-toluene adsorption capacity MOF (UiO66-NH2) is explored for its wireless detection. Results confirm the feasibility of the system for fast, reversible and selective toluene detection, being key the control of the active layer mass as well as the resonator geometry. Given the structural diversity of MOs, their use as active layers in magnetoelastic systems opens plenty of possibilities for the future design of wireless sensors for different hazardous substances.
4:45 PM Invited
Development of Magnetic Refrigeration Materials for Cryogenic Applications: Hossein Sepehri Amin1; Xin Tang1; J. Lai1; Anton Bolyachkin1; Tadakatsu Ohkubo1; Kazuhiro Hono1; 1National Institute for Materials Science
Hydrogen will play a major role in the establishment of carbon neutrality. However, one of the major challenges is H2 liquefaction required for its storage and transportation. Cryogenic magnetic refrigeration (CMR) is a prospective environmentally friendly and highly efficient technology for liquefaction of H2. However, the lack of magnetic refrigerant materials with high magnetic entropy change in a wide temperature range of 77-20 K required for the hydrogen liquefaction is a bottle-neck for practical applications of CMR. In this talk, we will first demonstrate how data science was employed to reduce the transition temperature of rare-earth free (Mn,Fe,Co)2(P,Si) based compounds below 100 K while maintaining giant magnetocaloric effect. In the second part of the talk, we will show a series of Er(Ho)Co2-based materials developed with a giant magnetic entropy change (-∆Sm > 0.2 Jcm-3K-1) but without thermal hysteresis suitable for operation in the full temperature range required for hydrogen liquefaction.