Monolayer ferromagnetism of Fe(110) on W(110) studied by Mössbauer spectroscopy

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Abstract
Fe(110) films in the monolayer regime were prepared at 300 K in UHV on W(110). Pseudomorphic structure and layer‐by‐layer growth were established using LEED, AES, and conversion electron Mössbauer spectroscopy (CEMS). For the pseudomorphic monolayer, ferromagnetic order was established using CEMS below a monolayer Curie temperature TC (1)=(210±10) K=0.20TC(∞) for a free monolayer and TC(1)=(296±1) K=0.28TC(∞) for a Ag‐coated monolayer, respectively. Magnetic hyperfine fields Bhf(T) could be measured for T≥90 K. Ground‐state values could be determined by extrapolation to Bhf(0)=(10±1) T for the free and Bhf(0)=(11.9±0.3) T for the Ag‐coated monolayer, respectively. A critical region 270<TBhf of the magnetic component remains finite with approach to TC. Beyond the true monolayer, double layer and monolayer components can be distinguished in the CEMS spectra.