Facile and fast synthesis of highly ordered L10-FeNi nanoparticles

From Disorder to Order: Inheritance of Magnetic Remanence in Tetrataenite‐Bearing Meteorites From Multi‐Phase Micromagnetic Modeling

“…The results of the present study show that optimal magnetic properties, that is, high thermal and field stability are achieved not only through complete atomic ordering of disordered FeNi, but are also predicted to occur in twophase, exchange-coupled partially ordered intergrowths containing both taenite and tetrataenite. Currently available experimental techniques are capable of producing ∼50%-60% of ordering in ∼20-120 nm sized nanoparticles in <24 hr (Varvaro et al, 2024). Therefore, our results provide key insights into possible alternative pathways in exploring partially ordered, FeNi-based nanomaterials as rare-earth-free permanent magnets and recording devices.…”

“…The low Ni mobility at tetrataenite's ordering temperature, however, makes it extraordinarily challenging to be synthesize in the laboratory (Lewis et al, 2014;Scorzelli, 1997). An active research field in material sciences is focused on exploring which parameters can possibly accelerate the production of tetrataenite, while keeping its exceptional magnetic properties (Lin et al, 2021;Tian et al, 2019Tian et al, , 2020Tian et al, , 2021Varvaro et al, 2024). Partial ordering of tetrataenite, that is, <20-30 nm sized nanoparticles containing regions of fully ordered tetrataenite within disordered taenite have already been experimentally produced (Lin et al, 2021), while complementary techniques provides promising routes for efficiently synthesizing partially ordered Fe-Ni nanoparticles with optimum magnetic properties in reasonable times (Varvaro et al, 2024).…”

Synthesis of highly ordered L10 MPt alloys (M = Fe, Co, Ni) from crystalline salts: an in situ study of the pre-ordered precursor reduction strategy

“…, L1 0 or L1 2 phases) is obtained by thermal activation of a diffusive process on a starting disordered alloy. For this reason, the PPR method is a potential synthesis approach that can be further extended, by properly selecting the precursor salt, for the synthesis under milder conditions than traditional thermal treatments of many other binary and ternary alloys, where the chemical order represents an indispensable property of the materials, as in the case of the L1 0 -FeNi, 59 L1 0 -MnAl and L1 0 -MnPt magnetic systems, which are of great interest for many applications including permanent magnets and spintronic devices.…”

“…), by properly selecting the starting salts, as recently proved by the authors of the present paper for the L1 0 -FeNi alloy. 59…”