Magnetostriction and magnetomechanical coupling of grain oriented Tb/sub 0.6/Dy/sub 0.4/ sheet

Clark, A. E.; Wun‐Fogle, M.; Restorff, J. B.; Lindberg, J.F.

doi:10.1109/20.281213

Cited by 11 publications

(6 citation statements)

References 4 publications

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“…As observed previously the magnetisation of pure polycrystalline Dy is well below the single crystal saturated value of 10 m B /atom. In the highest applied field of 8 T we were able to observe about 2/3 of the saturation magnetisation [16]. With 10% atomic Fe impurity the magnetisation drops below the value one would expect for the Fe coupled AFM with the Dy.…”

Section: Magnetic Behaviour Of Polycrystalline Dy Films Grown By Mbementioning

confidence: 79%

Ferromagnetism of Dy films containing embedded Fe atoms and nanoparticles

Iles

Binns

Baker

et al. 2010

Journal of Magnetism and Magnetic Materials

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Section: Magnetic Behaviour Of Polycrystalline Dy Films Grown By Mbementioning

confidence: 79%

Ferromagnetism of Dy films containing embedded Fe atoms and nanoparticles

Iles

Binns

Baker

et al. 2010

Journal of Magnetism and Magnetic Materials

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“…5 At 77 K magnetostrictions of 6300 ppm were reported. 4 The magnetic fields required to saturate the textured polycrystalline specimens are higher than our test apparatus can provide. Crystallographic texture should differ for the plane-and form-rolled specimens, since plane-rolled material will have better alignment of the basal planes.…”

Section: Materials Performancementioning

confidence: 83%

“…Because impurities inhibit grain growth, expensive high purity material is required for single crystal growth. 4 ͑Our commercial grade material has a total purity 99.7%, whereas the high purity material has a total purity of 99.94%.͒ The Next Generation Space Telescope may require 2000-3000 cryogenic actuators. Since it is not possible to produce single crystals in such numbers, textured polycrystals are being developed for use in actuator applications.…”

Section: Introductionmentioning

confidence: 99%

Magnetostriction of single crystal and polycrystalline Tb0.60Dy0.40 at cryogenic temperatures

Dooley

Lindensmith

Chave

et al. 1999

Journal of Applied Physics

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At cryogenic temperatures, single crystals of TbDy alloys exhibit giant magnetostrictions of nearly 9000 ppm, making these materials promising for engineering service in cryogenic actuators, valves, and positioners. The preparation of single crystals is difficult and costly. Preliminary results on the magnetostriction of textured polycrystalline materials are presented here. For instance, polycrystalline Tb 0.60 Dy 0.40 , plane-rolled ͑one direction of applied stress͒ to induce crystallographic texture, has shown magnetostrictions at 77 K of 3000 ppm for an applied field of 4.5 kOe and an applied load of 23 MPa, or 48% that of a single crystal under similar conditions. Comparisons are presented between the magnetostrictive response of plane-and form-rolled ͑two orthogonal directions of applied stress͒ polycrystalline Tb 0.60 Dy 0.40 at 10 and 77 K. It is reported that at 10 K plane-rolled Tb 0.60 Dy 0.40 exhibits 1600 ppm magnetostriction at an applied field of 4.4 kOe with a minimal applied load of 0.28 MPa. An observed restoration of the initial unstrained state may be a useful feature of polycrystalline materials for engineering service. Finally it is reported that thermal expansion measurements provide a measure of crystallographic texture for comparison with the magnetostriction.

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“…x 15mm x 150mm rods for the transducer elements. The available magnetostrictions achieved by this method were greater than 0.4 percent, approximately sixty-five percent of the available magnetostrictions of the single crystal bulk sample (Clark et al, 1993).…”

Section: Terbium-dysprosium Alloysmentioning

confidence: 87%

Application of High Temperature Superconducting Wire to Magnetostrictive Transducers for Underwater Sonar

Joshi¹,

Lindberg²,

Clark³

1997

Naval Engineers Journal

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A low‐frequency underwater acoustic transducer integrating high‐temperature superconducting (HTS) coils and terbium‐dysprosium (TbDy) magnetostrictive material was designed, fabricated and tested. This represents a novel application for high‐temperature superconductivity and is a first example of an integrated system involving HTS coils cooled by a mechanical cryocooler. It also brings HTS technology together with a novel magnetic materials technology. The HTS coils were fabricated using react‐and‐wind BiSrCaCuO‐2223 HTS wires. They produce a peak field of 0.1 Tesla at 50 K. A single‐stage, Stirling‐cycle cryocooler was used to cool the coils and the TbDy driver to cryogenic temperatures (50‐65K). The coils provide an AC magnetic field superimposed on a DC bias field, which produces oscillatory strain within the magnetostrictive rod; this motion is transmitted through a cryostat to two head masses which project sound into the surrounding environment. High power acoustic output can be obtained by operating the transducer at its resonance frequencies of 520 Hz in air and 430 Hz underwater. This development demonstrates that, unlike low temperature superconductors, HTS wires can be considered for AC applications due to the low losses in these superconductors and the higher heat capacities of materials at temperatures above liquid helium.

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Magnetostriction and magnetomechanical coupling of grain oriented Tb/sub 0.6/Dy/sub 0.4/ sheet

Cited by 11 publications

References 4 publications

Ferromagnetism of Dy films containing embedded Fe atoms and nanoparticles

Ferromagnetism of Dy films containing embedded Fe atoms and nanoparticles

Magnetostriction of single crystal and polycrystalline Tb0.60Dy0.40 at cryogenic temperatures

Application of High Temperature Superconducting Wire to Magnetostrictive Transducers for Underwater Sonar

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