Critical scattering of low-energy electrons by a ferromagnet in the neighborhood of the curie point

On the range of interaction from finite size scaling in magnetic Ni nanowires

“…Table 3 makes it apparent (see column 3) that our approach based on the experimental data of Ref. [6] provides the range of exchange of interaction that falls between those derived from earlier experiments [4,5], and agrees reasonably with that predicted by theory based on first-principles calculations (cf. Refs.…”

“…On the other hand, on the basis of pyromagnetic experiments of Argyle et al [4] a much higher range has been deduced [3,22]. As seen in Table 3, the present results are placed inbetween these of Vasil'ev et al [5] and Argyle et al [4]. In particular, one finds in Table 2 that for the interacting neighbors up to the 10th shell the value of hr 2 i en ¼ 582=85a 2 ¼ 6:85a 2 is still much lower than hr 2 i ¼ 16a 2 given by Keffer [3] following Argyle et al [4] experiment.…”

“…Alternatively, if we take as given the 3D value of b ¼ 0:33 [21], the fitting procedure yields R 2 ¼ 2:19 ðR ¼ 1:48Þ and Table 3. On the one hand, the critical scattering of low-energy electrons in the neighborhood of the T C of Ni has lead Vasil'ev et al [5] to the values of the quantity r þ c0 (said to characterize the radius of spin-spin exchange interactions) amounting to 1:221:4a. On the other hand, on the basis of pyromagnetic experiments of Argyle et al [4] a much higher range has been deduced [3,22].…”

“…Refs. [1,2] and references therein), our present knowledge of the range of exchange interaction in nickel comes either from pyromagnetic observations [3,4] or unique experiments on critical scattering of electrons near T C [5] that have lead to results rather different from each other. Therefore, each investigation that can elucidate this issue on the experimental basis appears substantiated.…”