Transition from ferromagnetism to mictomagnetism in Fe—Al alloys
Abstract
Alternating low-field susceptibility and steady-field magnetization measurements show the occurrence of mictomagnetism in Fe—Al alloys with either the [Fe 3Al] - or the [FeAl]-type atomic order over almost the entire composition range of these two phases. Fe 70Al 30 [Fe 3Al] becomes ferromagnetic on cooling below Tc = 400 K, it becomes superparamagnetic on further cooling below the "reversed Curie temperature" T ɔ ≈ 170 K and it becomes mictomagnetic below the freezing temperature of Tf = 92 K. Alloys Fe 70.5Al 29.5 to Fe 73Al 27 with [Fe 3Al] order transform directly from the ferromagnetic to the mictomagnetic state, without intermediate paramagnetism.
- Publication:
-
Solid State Communications
- Pub Date:
- December 1976
- DOI:
- 10.1016/0038-1098(76)91292-8
- Bibcode:
- 1976SSCom..20..863S