Home > Publications database > Huge intra-atomic dipole moment of the iron spin-density in the low temperature phase of magnetite > print

001     281650
005     20210129221812.0
037 _ _ |a FZJ-2016-01338
041 _ _ |a English
100 1 _ |a Schmitz, D.
|0 P:(DE-Juel1)164129
|b 0
|u fzj
111 2 _ |a XAFS16 satellite meeting “Application of XAFS to the study of magnetic Materials”
|c Stuttgart
|d 2015-08-30 - 2015-09-02
|w Germany
245 _ _ |a Huge intra-atomic dipole moment of the iron spin-density in the low temperature phase of magnetite
260 _ _ |c 2015
336 7 _ |a Poster
|b poster
|m poster
|0 PUB:(DE-HGF)24
|s 1454315593_19488
|2 PUB:(DE-HGF)
336 7 _ |a Conference Paper
|0 33
|2 EndNote
336 7 _ |a Output Types/Conference Poster
|2 DataCite
336 7 _ |a conferenceObject
|2 DRIVER
336 7 _ |a CONFERENCE_POSTER
|2 ORCID
336 7 _ |a INPROCEEDINGS
|2 BibTeX
520 _ _ |a Magnetite nanoparticles (NPs) with 6 nm diameter and a 200 nm thick magnetite reference film were studied with a combination of experimental and theoretical methods, i.e. x-ray absorption near edge spectroscopy (XANES), x-ray magnetic circular dichroism (XMCD), vibrating sample magnetometry (VSM) and electronic structure calculations based on density functional theory. For the NPs, increases of the white line intensity and the XMCD signal with increasing temperature were observed between 50 K and 100 K (Fig. 1a, b). A similar increase of the XMCD signal was also observed for the film between 125 K and 175 K, which is above its Verwey transition temperature of 120 K in agreement with the unusual temperature dependence of the magneto-crystalline anisotropy. A sum rule analysis of the XMCD spectra revealed that the transitions observed with XMCD are due to changing effective Fe spin moments. Since the transitions were not observed with VSM, we attribute them to changes of the intra-atomic dipole moment of the Fe 3d spin-density distribution, i.e. the Tz term in the XMCD sum rule for the effective spin moment. This conclusion was verified and explained theoretically. The sizable negative intra-atomic dipole moment in the monoclinic low-temperature phase of magnetite is due to the contribution of Fe2+ ions on B4 sites (-1.44 μB per atom) which is partly compensated by Fe2+ ions on B1 sites (0.72 μB per atom). It is a local indicator for the Verwey transition in small magnetite nanoparticles which is usually screened by blocking effects in classical magnetometry.
536 _ _ |a 522 - Controlling Spin-Based Phenomena (POF3-522)
|0 G:(DE-HGF)POF3-522
|c POF3-522
|f POF III
|x 0
700 1 _ |a Schmitz-Antoniak, C.
|0 P:(DE-Juel1)162347
|b 1
|u fzj
700 1 _ |a Warland, A.
|0 P:(DE-HGF)0
|b 2
700 1 _ |a Darbandi, M.
|0 P:(DE-HGF)0
|b 3
700 1 _ |a Haldar, S.
|0 P:(DE-HGF)0
|b 4
700 1 _ |a Bhandary, S.
|0 P:(DE-HGF)0
|b 5
700 1 _ |a Eriksson, O.
|0 P:(DE-HGF)0
|b 6
700 1 _ |a Sanyal, B.
|0 P:(DE-HGF)0
|b 7
700 1 _ |a Wende, H.
|0 P:(DE-HGF)0
|b 8
909 C O |o oai:juser.fz-juelich.de:281650
|p VDB
910 1 _ |a Forschungszentrum Jülich GmbH
|0 I:(DE-588b)5008462-8
|k FZJ
|b 0
|6 P:(DE-Juel1)164129
910 1 _ |a Forschungszentrum Jülich GmbH
|0 I:(DE-588b)5008462-8
|k FZJ
|b 1
|6 P:(DE-Juel1)162347
913 1 _ |a DE-HGF
|b Key Technologies
|l Future Information Technology - Fundamentals, Novel Concepts and Energy Efficiency (FIT)
|1 G:(DE-HGF)POF3-520
|0 G:(DE-HGF)POF3-522
|2 G:(DE-HGF)POF3-500
|v Controlling Spin-Based Phenomena
|x 0
|4 G:(DE-HGF)POF
|3 G:(DE-HGF)POF3
914 1 _ |y 2015
915 _ _ |a No Authors Fulltext
|0 StatID:(DE-HGF)0550
|2 StatID
920 1 _ |0 I:(DE-Juel1)PGI-6-20110106
|k PGI-6
|l Elektronische Eigenschaften
|x 0
980 _ _ |a poster
980 _ _ |a VDB
980 _ _ |a UNRESTRICTED
980 _ _ |a I:(DE-Juel1)PGI-6-20110106

LibraryCollectionCLSMajorCLSMinorLanguageAuthor
Marc 21