Complex incommensurate magnetic structure of FeMnP0.77Si0.23
Materials based upon Fe2P provides great opportunities for magnet refrigeration. Materials for magnetic refrigeration should, in the ideal case, be ferromagnetic and show a large entropy change when magnetised. Fe2P-type materials have such properties and the physical properties can be further tuned with substitutions to ensure suitable materials for real world applications. Upon substitution of Fe2P with Mn and Si, FeMnP0.75Si0.25 (synthesised within our group) reveals ordering into in an incommensurate structure. We studied the very similar compound FeMnP0.73Si0.27 using INS and the diffraction profile represents that of FeMnP0.75Si0.25. However, even though linear spin wave theory should be able to reproduce the excitations in the polarised state, using the magnetic wave vector determined previously, this has not been the case. When examining the old diffraction data (exp. in Prague), it was found that the signal to noise ratio and the maximum overall intensity is poor. We therefore ask for two diffraction patterns for the compound FeMnP0.73Si0.27, at RT and 2 K. This would allow us to examine the nuclear and magnetic structure so that the INS data can be fully interpreted.
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CEDERVALL Johan and Thomas C. Hansen. (2021). Complex incommensurate magnetic structure of FeMnP0.77Si0.23. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-1034
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