Magnetization has been measured as a function of inhyphen;plane applied field and temperature by measuring the spin polarization of lowhyphen;energy electrons (LEESPA) excited from the surface by an unpolarized electron beam (Ep=2 keV). These extremely surface sensitive data (probing 25 Aring;), taken on surfaces characterized by Auger electron spectroscopy, are compared with results obtained by magnetohyphen;optic Kerr effect (MOKE probing 250 Aring;) and bulk magnetometry. The LEESPAMhyphen;Hloops show considerably lower remanence than MOKE indicating appreciable surface anisotropy. The LEESPA polarization approaches zero at approximatelyTC=170thinsp;deg;C for both the Co and Fe base alloys with less curvature than bulk magnetization does. The bulkTCrsquo;s are 20thinsp;deg;C higher than those measured by LEESPA.
展开▼
