ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Results of a pulsed NMR study of the soft ferromagnetic amorphous alloy Co74.26Fe4.74Si2.1B18.9 in the as-cast and the heat treated (at 410 °C for 12 minutes) states re reported. The measurements were performed at 4.2 K. Very intense resonances lines are observed in the frequency region 10–110 MHz (range of the present study), for both as-cast and heat treated samples. The NMR signal intensity depends on the rf power level; this suggests the existence of several magnetic regions with different local anisotropies. We identify NMR lines in two frequency ranges: (a) 10–50 MHz, which probably come from 57Fe, 11B, and 29Si nuclei in Fe–Si-like regions and 57Fe in Co(Fe) solid solutions; and (b) for frequencies above 50 MHz, lines from 59Co (and probably 11B) in Co-rich crystalline-like environments with short-range order as in Co2B, in the range 70–110 MHz. In the higher frequency region, the NMR spectra suggest that the environments are similar to Co3B and to Co(B) solid solutions. For the heat treated sample, lines above 95 MHz disappear for lower rf power levels; also, this sample shows lines around 75 MHz narrower than those for the amorphous alloy. These results give evidence of the concentration inhomogeneity of the samples, both in the as-cast and heat-treated forms. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.362275
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