Publications by authors named "Hugo Martinez-Sanchez"
In this work, a bibliometric study was carried out to perform a scientific and technological analysis of exchange-spring magnets, an alternative permanent magnet synthesized by reducing or eliminating the use of critical raw materials, such as rare earths. The bibliometric analysis utilized the Scopus database, Orbit-Intellixir, VOSviewer, Orbit-Intelligence and Loglet Lab 4 software for maturity analysis, keyword network representations, charts and graphs for scientific articles and/or patents. A special analysis was performed on nanocomposite and thin-films systems based on Nd-Fe-B, SmCo and Mn-Al-C alloys, either mixed or layered with a soft magnetic phase, where relevant information on their magnetic parameters was compilated in tables, highlighting the nanostructured systems that have been exhibited the best permanent magnet properties.
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- The MnAlC alloy, which doesn't contain rare earth materials, is being recognized as a promising and affordable option for permanent magnets due to its high anisotropy field, saturation magnetization, and Curie temperature.
- A simple fabrication method was developed to produce a bulk -MnAlC magnet, utilizing electric arc-melting and a two-step heat treatment to achieve a pure -MnAlC ingot.
- The resulting -MnAlC showed improved magnetic properties with a remanent magnetization of 42 Am/kg and a maximum energy product of 6.07 kJ/m, surpassing previous results and demonstrating high-quality ferromagnetic behavior.
In this work, the mechanochemical synthesis method was used for the first time to produce powders of the nanocrystalline NdFeCoTi compound from NdO, FeO, Co and TiO. High-energy-milled powders were heat treated at 1000 °C for 10 min to obtain the ThMn-type structure. Volume fraction of the 1:12 phase was found to be as high as 95.
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