No abstract

Poly(methyl α‐chloroacrylate) (PMCA) and the copolymers of methyl methacrylate and methyl α‐chloroacrylate (poly(MMA‐co‐MCA)) have been reported recently to be more susceptible to radiation degradation than poly(methyl methacrylate) (PMMA). In this paper we report our studies of PMCA and poly(MMA‐co‐MCA) as electron‐sensitive positive resists. It has been found that both PMCA and the copolymers are more sensitive than PMMA. Using mixtures of dimethylformamide and 2‐propanol as developers, the sensitivities of PMCA and poly(MMA‐co‐MCA) (38 mole percent MCA) have been found to be 1 × 10−5 and 6 × 10−6 coulomb/cm2, respectively. It has also been found that crosslinking predominates in PMCA when the electron dose exceeds 6 × 10−4 coulomb/cm2.

No abstract

Isothermal magnetic-annealing experiments were carried out by means of torque measurements on a Ni(Fe) alloy containing 16% Fe and on Fe(Si) alloys with concentrations between 2.7 and 7.9 at. %Si. The measured torques showed an approximate exponential time-dependence in approaching equilibrium. The measured time constants for Ni(Fe) were greater than those of Fe(Si) by a factor of about 40 in the vicinity of 400°C. In the case of Ni(Fe), fair agreement of the induced uniaxial anisotropy coefficient, Ku, with previous quenching techniques was obtained by assuming Ku to vary with measuring temperature as the square of the saturation magnetization. For Fe(Si) the Ku-results permitted a comparison with directional-ordering theory applied to dilute alloys. The pair-energy coefficient derived from Ku was higher than that calculated from magnetostriction and elasticity data. It is suggested that this discrepancy may be due to the effect of second-nearest-neighbor contributions.

No abstract