Domain Orientation in Single Crystal TbFe(2) and Tb(.27) Dy(.73) Fe(2),

摘要

The investigators have observed 71 and 109 degree walls in single crystal TbFe(2) and Tb(.27)Dy(.73)Fe(2) (Terfenol) via the Kerr effect and synchrotron radiation topographs. A Terfenol (110) surface exposed to synchrotron radiation showed stripe-like domains with (110), 109 degree walls and (001), 71 degree walls. Cooling to approx. 273K caused an easy axis switch from to ; no domains were visible. Warming back to approx. 293K brought out mostly 109 degree walls. Stripelike domains were also seen in (110) and (100) TbFe(2) surfaces via the Kerr effect. In the (110) sample H fields along (001) and (110) directions created 109 and 71 degree walls respectively. With H applied at approx. 45 degree to both (001) and (110) directions 71 and 109 degree walls appeared simultaneously. The domain widths varied from 5 to 250 micrometers and fields of approx. 3000 Oe away from (001) and (110) directions saturated the sample. Walls in the (100) sample were also 71 or 109 degree but were only 2 to 15 micrometers wide.