Title :
Mossbauer measurements for a nanocrystalline Fe44Co44Zr7B4Cu1 alloy
Author :
Kopcewicz, M. ; Grabias, A. ; Willard, M.A. ; Laughlin, D.E. ; McHenry, M.E.
Author_Institution :
Inst. of Electron. Mater. Technol., Warsaw, Poland
fDate :
7/1/2001 12:00:00 AM
Abstract :
A two phase microstructure, consisting of nanocrystallites surrounded by an amorphous matrix, was produced by a melt spinning processing route. Alloys of this type have extrinsic properties that are dependent on the relative amounts of the amorphous and nanocrystalline phases. One method for examination of the properties of the nanocrystalline and amorphous phases is by Mossbauer spectroscopy. This paper examines ribbons with the composition of Fe44Co44 Zr7B4Cu1, both as-spun and after annealing at 650°C for 1 hour. Three Mossbauer techniques were used to examine these materials, including: transmission measurements, conversion electron Mossbauer spectroscopy, and radio frequency Mossbauer. The transmission spectrum for the annealed HITPERM alloy is composed of two superimposed sextets corresponding to the nanocrystalline FeCo and retained amorphous phases. The rf-Mossbauer results fail to show collapse of the sextet, indicating a large magnetocrystalline anisotropy of the nanocrystalline phase
Keywords :
Mossbauer effect; annealing; boron alloys; cobalt alloys; copper alloys; ferromagnetic materials; hyperfine interactions; iron alloys; magnetic anisotropy; melt spinning; nanostructured materials; soft magnetic materials; zirconium alloys; 650 C; Fe44Co44Zr7B4Cu1 ; HITPERM alloy; RF Mossbauer spectroscopy; amorphous phase; annealing; conversion electron Mossbauer spectroscopy; hyperfine field; magnetocrystalline anisotropy; melt spinning; nanocrystalline phase; soft magnetic material; transmission Mossbauer spectroscopy; two-phase microstructure; Amorphous materials; Annealing; Electrons; Frequency measurement; Iron; Magnetic materials; Microstructure; Spectroscopy; Spinning; Zirconium;
Journal_Title :
Magnetics, IEEE Transactions on
