Epitaxial Cu/Fe(20 Å)/Cu(x Å)/Fe( 60 Å) heterostructures with the Cu spacer thickness x ranging between 0 Å and 33 Å are grown on 7x7 reconstructed surface of Si (111) substrates. Fcc(111) Fe films grow epitaxially on a Cu(111) buffer layer up to a thickness of 6-8 Å, with a low-spin magnetic phase, while for larger thicknesses one observes the three-dimensional bcc Fe(110) domains in the Kurdjumov-Sachs orientation characterized by a magnetic moment close to that of bulk Fe. [1] Brillouin light scattering (BLS) from thermally excited spin waves has been exploited in order to study the interlayer exchange coupling between the two Fe films. The experimental spin wave frequency dependence on both the applied magnetic field and the incidence angle of light are simulated using a model which includes first-order intrinsic volume and interface anisotropies and takes into account both the bilinear and the biquadratic exchange interactions between the two ferromagnetic layers. The coupling is found to be ferromagnetic for the whole range of Cu spacer thicknesses investigated, in agreement with the surface magneto-optical Kerr effect (SMOKE) measurements. Using the magnetic parameters determined by the above analysis, we have carried out a detailed calculation of the BLS cross-section assuming the dynamic magnetization to be constant across each magnetic film. A very good agreement between the calculated and the measured cross sections has been obtained. References [1] G. Gubbiotti, L. Albini, S. Tacchi, G. Carlotti, R. Gunnella, and M. De Crescenzi, Phys. Rev. B 60, 17150 (1999). -- Presentazione poster by R. Zivieri - Conferenza nazionale
Brillouin light scattering in Fe(110)/Cu/Fe(110)/Cu/Si(111) heterostructures: bilinear and biquadratic exchange magnetic couplings -- Presentazione poster by R. Zivieri - Conferenza nazionale
ZIVIERI, Roberto;GIOVANNINI, Loris;NIZZOLI, Fabrizio
2000
Abstract
Epitaxial Cu/Fe(20 Å)/Cu(x Å)/Fe( 60 Å) heterostructures with the Cu spacer thickness x ranging between 0 Å and 33 Å are grown on 7x7 reconstructed surface of Si (111) substrates. Fcc(111) Fe films grow epitaxially on a Cu(111) buffer layer up to a thickness of 6-8 Å, with a low-spin magnetic phase, while for larger thicknesses one observes the three-dimensional bcc Fe(110) domains in the Kurdjumov-Sachs orientation characterized by a magnetic moment close to that of bulk Fe. [1] Brillouin light scattering (BLS) from thermally excited spin waves has been exploited in order to study the interlayer exchange coupling between the two Fe films. The experimental spin wave frequency dependence on both the applied magnetic field and the incidence angle of light are simulated using a model which includes first-order intrinsic volume and interface anisotropies and takes into account both the bilinear and the biquadratic exchange interactions between the two ferromagnetic layers. The coupling is found to be ferromagnetic for the whole range of Cu spacer thicknesses investigated, in agreement with the surface magneto-optical Kerr effect (SMOKE) measurements. Using the magnetic parameters determined by the above analysis, we have carried out a detailed calculation of the BLS cross-section assuming the dynamic magnetization to be constant across each magnetic film. A very good agreement between the calculated and the measured cross sections has been obtained. References [1] G. Gubbiotti, L. Albini, S. Tacchi, G. Carlotti, R. Gunnella, and M. De Crescenzi, Phys. Rev. B 60, 17150 (1999). -- Presentazione poster by R. Zivieri - Conferenza nazionaleI documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
