Self-Switching in Single-Heterojunction Injection Lasers

Abstract

Although the IPTS-68 is meant to be a close approximation to thermodynamic temperatures, its definition makes no provision for continuity in dt/dt68 at 630.74 " C . Any discontinuity in dt/dt68 at 630.74 " C is directly related to the corresponding discontinuity in the first derivative with respect to t6g of sensor output, so the former can be obtained from measurement of the latter. The magnitude of the discontinuity has not previously been measured precisely: it has an important bearing on elucidating the behaviour of ( t -i 6 g ) near 630.74"C. Over the temperature range from about 610 "C to 645 "C two calibrated platinum resistance thermometers, nine platinum -1Ooh rhodium/platinum thermocouples, and two other types of thermocouples have been intercompared in an experimental arrangement designed expressly to measure the discontinuity. The result for the relative discontinuity in dt/dt6g at 630.74 "C was found to be 0.51 k 0.10 percent.

Dynamics of ferromagnetic domain walls under extreme fields

“…For an isotropic material such as permalloy, K 1 4 µ 0 M 2 s [35]. In particular, for permalloy, M s 800 kA/m [36], so that the threshold is given approximately by 1 4 µ 0 M s 0.25 T. We note that early experiments on domain-wall motion in iron-garnet films at applied fields above the anisotropy threshold [37,38] indicate a sublinear velocity response compatible with (16). Radiation damping at high fields is discussed in a related theoretical work [39].…”

Direct optical observation of vertical Bloch lines propagation by in-plane field pulses

“…In the present paper, the motion of isolated VBLs along straight walls of the parallel stripe array in response to a pulsed magnetic in-plane field, H i p r (parallel to the wall) is studied by the methods of laser high-speed photography [9] and anisotropic dark field observation.…”