Angular Response of Magnetostrictive Thin Films

Li, Jianjun

doi:10.1155/2012/940272

Cited by 3 publications

(4 citation statements)

References 20 publications

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“…These results exhibit the similar trends to those reported by Ref. 20. In that work, the shape of the specimen was also rectangular, the same as ours; and the size (22×5×0.16 mm 3 ) was similar to ours.…”

Section: Effects Of Magnetic Field Strengths and Orientations On Deflsupporting

confidence: 91%

“…However, in Ref. 20, the deformation of the specimen was measured from both the long and the short directions. The results from the two directions showed that the deflections produced by magnetic field at different values of φ can be fitted by functions of cos 2 (φ) and sin 2 (φ), respectively.…”

Section: Effects Of Magnetic Field Strengths and Orientations On Deflmentioning

confidence: 99%

See 1 more Smart Citation

Comparisons of the deflections of magnetically smart films on alloy of NiCo and glass substrates

Ulmer¹,

Wang²,

Knapp³

et al. 2014

SPIE Proceedings

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This report begins with a review of the basic concept of deformable X-ray optics, and the need for this approach for future X-ray astronomy missions that have ∼ 1 resolution. We then report on our advances made on using magnetic smart materials (MSMs) to adjust the shape of thin (∼100-200 µm thickness) electroformed replicated optics or glass optics. We show that we can well model deflections in 5 mm × 20 mm glass pieces and we provide preliminary evidence that the concept will work that involves imposing a magnetic field on the hard magnetic substrate (NiCo) to maintain the change in mirror shape.

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Section: Effects Of Magnetic Field Strengths and Orientations On Deflsupporting

confidence: 91%

Section: Effects Of Magnetic Field Strengths and Orientations On Deflmentioning

confidence: 99%

Comparisons of the deflections of magnetically smart films on alloy of NiCo and glass substrates

Ulmer¹,

Wang²,

Knapp³

et al. 2014

SPIE Proceedings

View full text Add to dashboard Cite

show abstract

“…First to consider is why the deformation patterns were not symmetric with respect to the X-Y axes. There are at least 3 reasons: (a) the boundary conditions related to the mount will affect the shape changes; (b) the response of the Terfenol-D (T-D) is not isotropic; 4,10 and, the interaction between the EM induced stress and inherent stress from the T-D coating. At a minimum all of these effects can be calibrated and then taken into account in the implementation of a functional DM for wave front control.…”

Section: Discussionmentioning

confidence: 99%

Magnetic smart material application to synchrotron X-ray optics: prospects and current progress

Ulmer¹,

Quispe²,

Buchholz³

et al. 2022

Advances in X-Ray/Euv Optics and Components XVII

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Magnetic smart materials (MSMs) offer an alternative to the typical piezo-electric actuators that are currently being used to control X-ray optics on beam lines. MSMs combined with an overcoating of a magnetic hard material means a deformable mirror whose non-reflecting side is coated with a MSM plus magnetic hard overcoat can work in a power-off mode. The process works by using an electromagnet (EM) to impose a magnetic field in the bilayer of MSM and magnetic hard overcoat. Once the EM is turned off, the mirror settles to a new shape within minutes. The new shape can then remain intact for days. Since the EM is not fixed to the mirror, the exact placement of the magnetic field can be adjusted by relocating the EM. This feature allows for fine-scale adjustments and avoids the “dead pixel” replacement problem common with piezo patches that are attached to the mirror. We will give an overview and a progress report.

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“…The magnetic smart material (MSM) films are usually deposited on substrates by an RF or DC magnetron sputtering method. The sputtering targets can be of a cast composite type or can consist of pure element sources [10][11][12][13][14][15][16]. By adjusting the sputtering parameters like argon pressure, bias voltage and power, the magnetostrictive strains are different even for the same target materials.…”

Section: Introductionmentioning

confidence: 99%

Deformation of rectangular thin glass plate coated with magnetostrictive material

Wang¹,

Yao²,

Liu³

et al. 2016

Smart Mater. Struct.

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As magnetic smart materials (MSMs), magnetostrictive materials have great potential to be selected as coating materials for lightweight x-ray telescope mirrors due to their capability to tune the mirror profile to the desired shape under a magnetic field. To realize this potential, it is necessary to study the deformation of the mirror substrate with the MSM coating subjected to a localized magnetic field. In this paper, an analytical model is developed to calculate the deformation of rectangular coated samples locally affected by magnetostrictive strains driven by an external magnetic field. As a specific case to validate the model, a square glass sample coated with MSMs is prepared, and its deformation is measured in a designed experimental setup by applying a magnetic field. The measured deformation of the sample is compared with the results calculated from the analytical model. The comparison results demonstrate that the analytical model is effective in calculating the deformation of a coated sample with the localized mismatch strains between the film and the substrate. In the experiments, different shape patterns of surface profile changes are achieved by varying the direction of the magnetic field. The analytical model and the experimental method proposed in this paper can be utilized to further guide the application of magnetostrictive coating to deformable lightweight x-ray mirrors in the future.

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Angular Response of Magnetostrictive Thin Films

Cited by 3 publications

References 20 publications

Comparisons of the deflections of magnetically smart films on alloy of NiCo and glass substrates

Comparisons of the deflections of magnetically smart films on alloy of NiCo and glass substrates

Magnetic smart material application to synchrotron X-ray optics: prospects and current progress

Deformation of rectangular thin glass plate coated with magnetostrictive material

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