28 June 2015 to 3 July 2015
Africa/Johannesburg timezone
SAIP2015 Proceeding published on 17 July 2016

Collective Electronic Excitations in Ferromagnetic Metals

3 Jul 2015, 11:10
20m
Oral Presentation Track A - Division for Physics of Condensed Matter and Materials DPCMM

Speaker

Dr Volkmar Nolting (Vaal University of Technology)

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Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

Collective electronic excitations in the system of interacting conduction electrons of ferromagnetic metals (Fe, Co, Ni) are investigated. These conduction electrons stem from relatively narrow d-type bands and a suitable model to describe them is the Hubbard model. Treating the Thomas-Fermi screening as a dynamic phenomenon yields oscillations in the electron density. These charge density waves (plasmons) are determined from the poles of the dielectric function ε(q,E) that is approximately evaluated within the random phase approximation RPA. On the other hand, spin wave energies (magnons) are identical to the poles of the transverse susceptibility. Magnetizations m(T,n) , Curie temperatures TC (n), and the temperature dependent exchange splitting ΔEex are calculated within reasonable agreement with experimental results.

Main supervisor (name and email)<br>and his / her institution

n.a.

Primary author

Dr Volkmar Nolting (Vaal University of Technology)

Presentation Materials