INVESTIGADORES
PASQUEVICH Gustavo Alberto
congresos y reuniones científicas
Título:
Thickness and polarization effects in magnetic Mössbauer scans
Autor/es:
P. MENDOZA ZÉLIS; G. A. PASQUEVICH; A. LENCINA
Lugar:
La Plata - Argentina
Reunión:
Conferencia; XI Latin American Conference on the Applications of the Mössbauer Effect; 2008
Resumen:
Over the last years, Mössbauer Scans, that is the Mössbauertransmission recorded at fixed photon energies as a function of a givenphysical parameter such as temperature, external field, etc., are beingdeveloped as useful quantitative tools, complementary to Mössbauerspectroscopy [1,2]. In a Mössbauer Magnetic Scan ( MMS )[2,Poster T06-3] the transmission is recorded while the sample is subjectto an ac magnetic field. MMSs are promising because additionalinformation can be obtained if compared to conventional Mössbauerspectroscopy. Additoinaly, MMSs are of easy implementation.For a pure magnetic hyperfine splitting, the Mössbauer absorptiondepends on the sample magnetic moments distribution (MMD). If a thinabsorber is considered, this dependence is only determined by the mean-square of the MMD projection in the gdirection, which is a second-rayorder momentum of the MMD. thicker absorbers, the MössbauerForpattern depends on one first order momentum and four second ordermomenta of the MMD. Thickness effect occurs due to the fact that thegchanges its polarization state as it goes through the sample. This-rayeffect appears even if the source is not polarized. Then, by properlychoosing a set of MMSs the determination of the MMD dependence onthe magnetic field applied can be performed, in a quasi-continuous way.