This paper will present the procedure of measuring the deformation of the magnetostrictive bimorph specimens under an
applied external magnetic field, and the theoretical and numerical analysis of the deformation. The magnetically smart
material (MSM) KelvinAllTM and Terfenol-D is deposited on the nickel or glass substrates. The profiles of thin-film
specimens were measured under an external magnetic field with White Light Interferometry. Using the theoretical
calculation, the magnetostrictive property was evaluated for the coated Ni sample and glass sample. Employing the
numerical approach, the influence of the magnetostrictive film on the deformation of the sample was simulated and
compared with experimental results. The coated Ni specimen exhibited larger deformation than the coated glass
specimen when the specimen is immersed in a 0.16 T magnetic field. In our experiments, the residual stress calculated in
the thin film of the bimorph is acceptable and could be decreased by changing the parameters in the specimen
preparation process. The experimental results in this paper was employed as the preliminary step to realize the future
application of the magnetostrictive thin film bimorph to the adaptive X-ray mirror, and the theoretical and numerical
approach was used to predict the influence of the magnetostrictive film on the larger mirror surface deformation.
There is a basic need both in X-ray astronomy and in synchrotron X-ray and neutron beam optics to be able to modify the shape of an optic via an external source of actuation. We describe a technique of shape modification that can be applied to thin walled (∼ 100-400 micron thickness) electroformed replicated optics or glass optics to improve the near net shape of the mirror as well as the mid-frequency (∼ 2-10 mm length scales) ripple. The process involves sputter deposition of a magnetic smart material (MSM) film onto a magnetically hard material (i.e., one that retains a magnetic field, e.g. the material in hard disk drives). The MSM material exhibits strains about 400 times stronger than ordinary ferromagnetic materials. The deformation process involves a magnetic write head which traverses the surface, and under the guidance of active metrology feedback, locally magnetizes the surface to impart strain where needed. We describe the results of our current progress toward our ultimate goal of improving the angular resolution of grazing incidence optics.
There is a basic need both in X-ray astronomy and in synchrotron X-ray optics to be able to modify the shape of
an optic via an external source of actuation. We describe a technique of shape modification that can be applied
to thin walled (~ 100-400 micron thickness) electroformed replicated optics or glass optics to improve the near
net shape of the mirror as well as the mid-frequency (~ 2-10 mm length scales) ripple. The process involves
sputter deposition of a magnetic smart material (MSM) film onto a magnetically hard material (i.e., one that
retains a magnetic field, e.g. the material in hard disk drives). The MSM material exhibits strains about 400
times stronger than ordinary ferromagnetic materials. The deformation process involves a magnetic write head
which traverses the surface, and under the guidance of active metrology feedback, locally magnetizes the surface
to impart strain where needed. We describe the results of our current progress toward our ultimate goal of
improving the angular resolution of grazing incidence optics.
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