Effect of grain-boundary diffusion process on the geometry of the grain microstructure of Nd−Fe−B nanocrystalline magnets

in Physical Review Materials (2019), 3(084410),

Magnetic Guinier Law

Poster (2019, June)

We introduce the Guinier law for the case of magnetic SANS and provide an analysis of experimental data on a Nd-Fe-B-based nanocomposite and on a rare-earth-free MnBi permanent magnet. The robustness of ... [more ▼]

We introduce the Guinier law for the case of magnetic SANS and provide an analysis of experimental data on a Nd-Fe-B-based nanocomposite and on a rare-earth-free MnBi permanent magnet. The robustness of this novel approach is discussed and the quantities derived are analyzed in the framework of the existing research literature. [less ▲]

Magnetic small-angle neutron scattering

in Reviews of Modern Physics (2019), 91

Microstructural-defect-induced Dzyaloshinskii-Moriya interaction

in Physical Review. B, Condensed Matter (2019), 99

Magnetic neutron scattering on nanomagnets

Scientific Conference (2018, September 26)

Magnetic neutron scattering on bulk ferromagnets

Presentation (2018, July 12)

Magnetic neutron scattering studies on magnetic materials

Scientific Conference (2018, March 11)

Towards understanding of magnetization reversal in Nd-Fe-B nanocomposites: analysis by high-throughput micromagnetic simulations

in Journal of Physics : Condensed Matter (2018), 30

We demonstrate how micromagnetic simulations can be employed in order to characterize and analyze the magnetic microstructure of nanocomposites. For the example of nanocrystalline Nd-Fe-B, which is a ... [more ▼]

We demonstrate how micromagnetic simulations can be employed in order to characterize and analyze the magnetic microstructure of nanocomposites. For the example of nanocrystalline Nd-Fe-B, which is a potential material for future permanent-magnet applications, we have compared three different models for the micromagnetic analysis of this material class: (i) a description of the nanocomposite microstructure in terms of Stoner-Wohlfarth particles with and without the magnetodipolar interaction; (ii) a model based on the core-shell representation of the nanograins; (iii) the latter model including a contribution of superparamagnetic clusters. The relevant parameter spaces have been systematically scanned with the aim to establish which micromagnetic approach can most adequately describe experimental data for this material. According to our results, only the last, most sophisticated model is able to provide an excellent agreement with the measured hysteresis loop. The presented methodology is generally applicable to multiphase magnetic nanocomposites and it highligths the complex interrelationship between the microstructure, magnetic interactions, and the macroscopic magnetic properties. [less ▲]

Magnetic SANS as a probe to disclose internal interfaces and the spin structure of nanoparticles

Scientific Conference (2017, October 11)

Spin structure of Nd-Fe-B-based textured nanocomposites:role of interface chemistry

Scientific Conference (2017, July 02)