Magnetoelectric Coupling in Multi-Ferro Fe-Pd/PZT/Fe-Pd Laminate Composites

2010 ◽  
Vol 67 ◽  
pp. 98-103 ◽  
Author(s):  
Teiko Okazaki ◽  
Yasubumi Furuya ◽  
Yusuke Sado ◽  
Yoshiyuki Hayashi ◽  
Syunsuke Sato ◽  
...  
Keyword(s):  
Shape Memory ◽  
Rapid Solidification ◽  
Magnetoelectric Coupling ◽  
Laminate Composites ◽  
Ferromagnetic Shape Memory

Magnetoelectric(ME) coupling in multi-ferroic composite designed by using two material elements of Pb(Zr, Ti)O3 (PZT: 260μm) and magnetostrictive alloys(Galfenol based Fe-Ga-X(X=Al, Co), ferromagnetic shape memory Fe-Pd) was investigated. Output ME Voltage under the driving a.c.magnetic field Hac at f = 1 Hz in Fe81Ga19/PZT/ Fe81Ga19, Fe80Ga15Al5 /PZT/ Fe80Ga15Al5, Fe76Ga17Co7/PZT/ Fe76Ga17Co7 composites, in which the magnetostrictive foils(50μm thickness) were prepared by rapid solidification, increased in proportion to the actuated force than the magnetostriction.Moreover，output ME Voltage in Fe70Pd30 / PZT/ Fe70Pd30 laminates, in which the Fe70Pd30 films (10μm thickness) on PZT were deposited by sputtering method, exhibited 8 V at Hac of 175Oe, which is larger than 7.16 V for Fe76Ga17Co7 (50μm)/PZT/ Fe76Ga17Co7 (50μm) composites

Rapid-Solidified Metallic Actuator Materials Developed by Electromagnetic Nozzleless Melt Spinning Method

1999 ◽  
Vol 604 ◽  
Author(s):  
Y. Furuya
Keyword(s):  
Shape Memory ◽  
Rapid Solidification ◽  
Melt Spinning ◽  
Material Design ◽  
Thin Plates ◽  
Molten Metals ◽  
Short Fibers ◽  
Crystal Anisotropy ◽  
Electro Magnetic ◽  
Ferromagnetic Shape Memory

AbstractElectro-magnetic nozzleless melt-spinning method was developed by combining the control of the flow down of the molten metals after electromagnetic float-melting(i.e. levitation) with rapid solidification by rotating roll. The metallurgical grain microstructures can be changed by rotating roll speed. It was confinned that the produced, intermetallic TiNi and NiAl system alloy thin plates showed the strong crystal anisotropy, higher shape memory functional properties than those of the conventionally processed melt-worked samples having its same origin. As new SMAs by using this method, ferromagnetic shape memory, FePd alloy having very large magnetostriction and super high temperature shape memory, RuTa alloy having the transformation over 1000°C were developed. Moreover, our recent study on the advanced rapid-solidification machine to produce many kinds of short fibers as well as ribbons is introduced. Finally, harmonic material design for sensor/actuator stacking composite system, namely “Smart Board” for aircraft structures will be introduced.

Development of Ni-Mn-Ga Based Ferromagnetic Shape Memory Alloy by Rapid Solidification Technique

2008 ◽  
Vol 52 ◽  
pp. 17-27
Author(s):  
Amitava Mitra ◽  
A.K. Panda
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Rapid Solidification ◽  
Melt Spinning ◽  
X Ray Diffraction ◽  
Ferromagnetic Shape Memory Alloy ◽  
Electron Microscopic ◽  
Transmission Electron ◽  
Rapid Solidification Technique ◽  
Ferromagnetic Shape Memory

Rapid solidification route by melt spinning has been adopted for preparation of a Ni52.5Mn24.5Ga23 (at %) ferromagnetic shape memory alloy in the form of ribbons. In the as-spun state, the ribbon revealed a predominant austenitic L21 structure in combination with martensitic feature as observed from x-ray diffraction studies. Transmission electron microscopic (TEM) evaluation showed these features in the form of martensitic plates. At low temperature, martensite to austenite transformation was exhibited by an increase in magnetization during heating cycle. The reverse effect was observed during cooling cycle. Annealing temperature and magnetising field was also found to effect this transformation.

Rapid-Solidification Effect on Magnetostriction in Iron-based Ferromagnetic Shape Memory Alloy

2001 ◽  
Vol 703 ◽  
Author(s):  
Yasubumi Furuya ◽  
Takeshi Kubota ◽  
Teiko Okazaki ◽  
Mitsutaka Sato ◽  
Manfred Wuttig
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Rapid Solidification ◽  
Melt Spinning ◽  
Rolling Direction ◽  
Magnetic Field Direction ◽  
Ferromagnetic Shape Memory Alloy ◽  
Ribbon Sample ◽  
Giant Magnetostriction ◽  
Ferromagnetic Shape Memory

ABSTRACTFe-29.6at%Pd ferromagnetic shape memory alloy (FSMA) ribbon formed by rapidly solidified, melt-spinning methods is expected to be useful as a new type of material which shows giant magnetostriction as well as quick response. The giant magnetostriction in the rolling direction depends strongly on applied magnetic-field direction and has a maximum value of 8×10-4 when the field is normal to the surface. This phenomenon is caused by the rearrangements of activated martensitic twin variants. The inverse phase transformation temperatures (As) obtained from Laser micrographs and magnetization vs. temperature curve are ∼307 K and 400∼440 K, respectively. We analyze magnetostriction, magnetic property and crystal structure of Fe-29.6at%Pd bulk sample before rapid solidification and the ribbon sample. From these results, it can be concluded that remarkable anisotropy of giant magnetostriction of ribbon sample is caused by the fine structure formed by the melt-spinning method. It may be possible to apply this method successfully to other FSMA and Ni2MnGa, which is difficult to manufacture owing to its brittleness.

Magnetic properties of ferromagnetic shape memory alloys Ni _{2-x} Cu _{x} MnGa

2005 ◽  
Vol 21 (3-4) ◽  
pp. 151-157 ◽  
Author(s):  
Takeshi Kanomata ◽  
Takuji Nozawa ◽  
Daisuke Kikuchi ◽  
Hironori Nishihara ◽  
Keiichi Koyama ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Ferromagnetic Shape Memory Alloys ◽  
Ferromagnetic Shape Memory
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