Next Article in Journal
Direct As(V) Determination Using Screen-Printed Electrodes Modified with Silver Manoparticles
Previous Article in Journal
PMMA-TiO2 Fibers for the Photocatalytic Degradation of Water Pollutants
Open AccessArticle

Mn-Induced Thermal Stability of L10 Phase in Fept Magnetic Nanoscale Ribbons

1
National Institute for Materials Physics, P.O. Box MG-7, 077125 Magurele, Romania
2
National Institute for Physics and Nuclear Engineering, P.O. Box MG-6, 077125 Magurele, Romania
3
R&D Consulting and Services S.R.L., 023761 Bucharest, Romania
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(7), 1278; https://doi.org/10.3390/nano10071278
Received: 2 June 2020 / Revised: 21 June 2020 / Accepted: 25 June 2020 / Published: 30 June 2020
Magnetic nanoscale materials exhibiting the L10 tetragonal phase such as FePt or ternary alloys derived from FePt show most promising magnetic properties as a novel class of rare earth free permanent magnets with high operating temperature. A granular alloy derived from binary FePt with low Pt content and the addition of Mn with the nominal composition Fe57Mn8Pt35 has been synthesized in the shape of melt-spun ribbons and subsequently annealed at 600 °C and 700 °C for promoting the formation of single phase, L10 tetragonal, hard magnetic phase. Proton-induced X-ray emission spectroscopy PIXE has been utilized for checking the compositional effect of Mn addition. Structural properties were analyzed using X-ray diffraction and diffractograms were analyzed using full profile Rietveld-type analysis with MAUD (Materials Analysis Using Diffraction) software. By using temperature-dependent synchrotron X-ray diffraction, the disorder–order phase transformation and the stability of the hard magnetic L10 phase were monitored over a large temperature range (50–800 °C). A large interval of structural stability of the L10 phase was observed and this stability was interpreted in terms of higher ordering of the L10 phase promoted by the Mn addition. It was moreover found that both crystal growth and unit cell expansion are inhibited, up to the highest temperature investigated (800 °C), proving thus that the Mn addition stabilizes the formed L10 structure further. Magnetic hysteresis loops confirmed structural data, revealing a strong coercive field for a sample wherein single phase, hard, magnetic tetragonal L10 exists. These findings open good perspectives for use as nanocomposite, rare earth free magnets, working in extreme operation conditions. View Full-Text
Keywords: nanocomposite magnets; L10 FeMnPt; structural stability; temperature-dependent X-ray diffraction nanocomposite magnets; L10 FeMnPt; structural stability; temperature-dependent X-ray diffraction
Show Figures

Figure 1

MDPI and ACS Style

Crisan, A.; Leca, A.; Pantelica, D.; Dan, I.; Crisan, O. Mn-Induced Thermal Stability of L10 Phase in Fept Magnetic Nanoscale Ribbons. Nanomaterials 2020, 10, 1278.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop