Dr. Marilyn Wun-Fogle Profile

Dr. Marilyn Wun-Fogle

Research Scientist at Naval Surface Warfare Ctr

SPIE Involvement:

Author

Publications (8)

Proceedings Article | 2 April 2008 Paper

Performance improvements in Galfenol laminated rods with stress annealing

Jin-Hyeong Yoo, James Restorff, Marilyn Wun-Fogle, Alison Flatau

Proceedings Volume 6929, 69291Y (2008) https://doi.org/10.1117/12.778339

KEYWORDS: Annealing, Magnetism, Magnetostrictive materials, Anisotropy, Rods, Solids, Transducers, Ceramics, Iron, Mechanical engineering

Read Abstract +

The recent discovery of Galfenol as a "large" magnetostrictive material (as high as 400με) offers a particularly promising transducer material that combines largely desirable mechanical attributes with superior magnetic properties. The high permeability of this material makes it easy to magnetize, however it also causes a relatively low cutoff frequency in dynamic applications, above which eddy currents form and introduce significant power losses. To reduce the eddy current losses, magnetostrictive drivers used in dynamic applications are commonly laminated. A second transducer design consideration is that in materials which exhibit positive magnetostriction, it is common to impose an initial compressive "prestress" to the material that is sufficient to align the orientation of the magnetic moments within the material to a direction perpendicular to the stress axis. This is done to maximize the magnetostriction realized when a magnetic field applied along the stress axis rotates the moments parallel to the stress axis. An alternative to the application of a compressive prestress is to build-in a uniaxial magnetic anisotropy through stress annealing. Stress annealing is a high temperature process with simultaneous application of a compressive load and subsequent cooling under load in which the magnetic moment alignment developed at temperature is retained upon removal from the stress anneal fixture. The compressive load needed to build in a useful uniaxial magnetic anisotropy in Galfenol is greater than the buckling load for Galfenol laminae sized for use in high frequency dynamic applications. In this study, prior work on stress annealing of solid rods of single and polycrystalline samples of Galfenol is successfully extended to thin laminae of Galfenol by introducing fixtures needed to avoid buckling. The standard stress annealing device uses a hydraulic actuator to apply compressive stress to the sample. Two linear guides have been added to ensure a normal compression load path to reduce the potential for buckling of thin laminations. In addition, a mechanical holding fixture was used to maintain proper alignment of the thin laminations during stress annealing. Data are presented that demonstrate the magnetic uniaxial anisotropy developed by stress annealing of laminated Galfenol rods.

Proceedings Article | 6 April 2006 Paper

Effect of stress annealing on Galfenol and Alfenol magnetostrictive alloys

A. Clark, J. Restorff, M. Wun-Fogle, Eric Summers

Proceedings Volume 6170, 61700I (2006) https://doi.org/10.1117/12.657980

KEYWORDS: Magnetostrictive materials, Gallium, Annealing, Magnetism, Anisotropy, Iron, Aluminum, Heat treatments, Warfare, Temperature metrology

Read Abstract +

Proceedings Article | 16 May 2005 Paper

Effect of cyclic stresses and magnetic fields on stress-annealed Galfenol alloys

J. Slaughter, J. Raim, M. Wun-Fogle, J. Restorff

Proceedings Volume 5761, (2005) https://doi.org/10.1117/12.599878

KEYWORDS: Magnetism, Magnetostrictive materials, Annealing, Iron, Gallium, Transducers, Failure analysis, Resistance, Computer simulations, Warfare

Read Abstract +

Proceedings Article | 16 May 2005 Paper

Elevated temperature aging of stress annealed Fe-Ga transduction alloys with built-in uniaxial stress anisotropies

M. Wun-Fogle, J. Restorff, A. Clark, Eric Summers

Proceedings Volume 5761, (2005) https://doi.org/10.1117/12.599881

KEYWORDS: Anisotropy, Magnetostrictive materials, Annealing, Iron, Magnetism, Gallium, Data modeling, Crystals, Solids, Warfare

Read Abstract +

Proceedings Article | 21 July 2004 Paper

Magnetostriction of stress-annealed Fe-Ga-Al and Fe-Ga alloys under compressive and tensile stress

Marilyn Wun-Fogle, James Restorff, Arthur Clark

Proceedings Volume 5387, (2004) https://doi.org/10.1117/12.539922

KEYWORDS: Magnetostrictive materials, Magnetism, Annealing, Iron, Gallium, Aluminum, Crystals, Ceramics, Heat treatments, Warfare

Read Abstract +

Proceedings Article | 13 August 2003 Paper

Mechanical properties of magnetostrictive iron-gallium alloys

Rick Kellogg, Alan Russell, Thomas Lograsso, Alison Flatau, Arthur Clark, Marilyn Wun-Fogle

Proceedings Volume 5053, (2003) https://doi.org/10.1117/12.484347

KEYWORDS: Crystals, Gallium, Iron, Anisotropy, Aluminum, Crystallography, Metals, Single crystal X-ray diffraction, Aerospace engineering, Chemical species

Read Abstract +

Proceedings Article | 11 July 2002 Paper

Modern magnetostrictive materials: classical and nonclassical alloys

Arthur Clark, Marilyn Wun-Fogle

Proceedings Volume 4699, (2002) https://doi.org/10.1117/12.474998

KEYWORDS: Magnetostrictive materials, Magnetism, Dysprosium, Terbium, Iron, Crystals, Gallium, Anisotropy, Shape memory alloys, Ferromagnetics

Read Abstract +

Proceedings Article | 11 July 2001 Paper

Magnetostrictive and piezomagnetic properties of Tb(1-x)Dy(x)Zn at low temperatures

Marilyn Wun-Fogle, James Restorff, Arthur Clark, James Cullen, Thomas Lograsso

Proceedings Volume 4333, (2001) https://doi.org/10.1117/12.432752

KEYWORDS: Magnetostrictive materials, Magnetism, Anisotropy, Dysprosium, Terbium, Crystals, Samarium, Information operations, Ions, Temperature metrology

Read Abstract +

Showing 5 of 8 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years