Rare earth magnetostrictive materials

1989 ◽  
Vol 85 (S1) ◽  
pp. S61-S61 ◽  
Author(s):  
Arthur E. Clark
Keyword(s):  
Rare Earth ◽  
Magnetostrictive Materials

scholarly journals Engineering new limits to magnetostriction through metastability in iron-gallium alloys

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
P. B. Meisenheimer ◽  
R. A. Steinhardt ◽  
S. H. Sung ◽  
L. D. Williams ◽  
S. Zhuang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Intermetallic Phase ◽  
High Sensitivity ◽  
Magnetic Field Sensors ◽  
Magnetostrictive Materials ◽  
Piezoelectric Elements ◽  
Ordered Intermetallic ◽  
Gallium Alloys ◽  
The Stability ◽  
Beyond Cmos

AbstractMagnetostrictive materials transduce magnetic and mechanical energies and when combined with piezoelectric elements, evoke magnetoelectric transduction for high-sensitivity magnetic field sensors and energy-efficient beyond-CMOS technologies. The dearth of ductile, rare-earth-free materials with high magnetostrictive coefficients motivates the discovery of superior materials. Fe1−xGax alloys are amongst the highest performing rare-earth-free magnetostrictive materials; however, magnetostriction becomes sharply suppressed beyond x = 19% due to the formation of a parasitic ordered intermetallic phase. Here, we harness epitaxy to extend the stability of the BCC Fe1−xGax alloy to gallium compositions as high as x = 30% and in so doing dramatically boost the magnetostriction by as much as 10x relative to the bulk and 2x larger than canonical rare-earth based magnetostrictors. A Fe1−xGax − [Pb(Mg1/3Nb2/3)O3]0.7−[PbTiO3]0.3 (PMN-PT) composite magnetoelectric shows robust 90° electrical switching of magnetic anisotropy and a converse magnetoelectric coefficient of 2.0 × 10−5 s m−1. When optimally scaled, this high coefficient implies stable switching at ~80 aJ per bit.

Giant dynamic magnetostrain in rare earth-iron magnetostrictive materials

1991 ◽  
Vol 27 (6) ◽  
pp. 5343-5345 ◽  
Author(s):  
F. Claeyssen ◽  
D. Colombani ◽  
A. Tessereau ◽  
B. Ducros
Keyword(s):  
Rare Earth ◽  
Magnetostrictive Materials

Characterization of Rare-Earth Fluoride Anti-Stokes Phosphors by Scanning arid Transmission Electron Microscopy

1971 ◽  
Vol 29 ◽  
pp. 142-143
Author(s):  
N. M. P. Low ◽  
L. E. Brosselard
Keyword(s):  
Electron Microscopy ◽  
Rare Earth ◽  
Elevated Temperatures ◽  
Stoichiometric Composition ◽  
Rare Earth Ions ◽  
Crystalline Solid ◽  
Precipitation Process ◽  
Rare Earth Fluoride ◽  
Earth Fluoride ◽  
Rare Earth Fluorides

There has been considerable interest over the past several years in materials capable of converting infrared radiation to visible light by means of sequential excitation in two or more steps. Several rare-earth trifluorides (LaF3, YF3, GdF3, and LuF3) containing a small amount of other trivalent rare-earth ions (Yb3+ and Er3+, or Ho3+, or Tm3+) have been found to exhibit such phenomenon. The methods of preparation of these rare-earth fluorides in the crystalline solid form generally involve a co-precipitation process and a subsequent solid state reaction at elevated temperatures. This investigation was undertaken to examine the morphological features of both the precipitated and the thermally treated fluoride powders by both transmission and scanning electron microscopy.Rare-earth oxides of stoichiometric composition were dissolved in nitric acid and the mixed rare-earth fluoride was then coprecipitated out as fine granules by the addition of excess hydrofluoric acid. The precipitated rare-earth fluorides were washed with water, separated from the aqueous solution, and oven-dried.

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