Induced Magnetic Hyperfine Field at Ag Sites near an Fe(100)/Ag(100) Interface

A magnetic hyperfine field induced at Ag sites near the interface between a Ag(100) crystal and an epitaxially grown bcc Fe(100) film has been measured with monolayer resolution. Utilizing perturbed-angular-correlation spectroscopy with ${}^{111}\mathrm{In}$ probes a magnetic hyperfine field in the first atomic Ag layer is found to be strongly reduced relative to the Fe bulk value and decreases very quickly as a function of distance from the interface. For both sides of the interface the temperature dependence is well described by a $T^{3/2}$ spin-wave behavior; however, it is strongly enhanced on the nonmagnetic side.