Sperl, Matthias and Kipferl, Wolfgang and Dumm, Martin and Bayreuther, Günther (2006) Spin-wave excitations in epitaxial ultrathin FeCo with zero magnetocrystalline anisotropy. Journal of Applied Physics 99, 08J703.
Download (300kB) - Repository staff only
Spin-wave theory predicts reduced thermal spin-wave excitations due to a magnetic anisotropy. Recent results show that a strong uniaxial in-plane anisotropy in ultrathin Fe/GaAs(001) films indeed stabilizes the ferromagnetic order versus thermal spin excitations [Kipferl et al., J. Appl. Phys. 97, 10B313 (2005)]. In order to study whether a fourth-order in-plane anisotropy has a similar effect epitaxial Fe70Co30/Au(001) samples with zero magnetocrystalline anisotropy were studied and compared to results for Fe/Au(001). The temperature dependence of the spontaneous magnetization MS for T0.5Tc can be well described by the Bloch [Z. Phys. 61, 206 (1930)] T3/2 law in the entire thickness range. However, for each thickness B is reduced in Fe70Co30/Au(001) compared to Fe/Au(001) films despite the reduced anisotropy. This means that the effect of a weak in-plane anisotropy is overcompensated by the enhanced exchange interaction.
|Institutions:||Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Günther Bayreuther|
|Projects:||Forschergruppe Ferromagnet-Halbleiter Nanostrukturen|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||20 Mar 2007|
|Last Modified:||20 Jul 2011 21:02|