Magnetoelectric microwave phase shifters

Microwave magnetoelectric effects in single crystal bilayers of yttrium iron garnet and lead magnesium niobate-lead titanate

“…For bulk YIG-PZT composites, the measured A = 0.33 Oe cm/kV is an order of magnitude smaller than current values for single crystal bilayers. 9 We recently performed microwave ME studies on multilayers of LFO-PZT. 13 The sample contained 16 layers of LFO and 15 layers of PZT, with a layer thickness of 15 µm.…”

“…Studies on bulk polycrystalline samples of 90 wt.% YIG -10% PZT revealed weak ME interactions because of low PZT concentration. 9 But when the concentration of PZT was increased, FMR line broadening masked electric field effects on the resonance field. Such line broadening problems, however, could easily be eliminated in a layered structure of YIG-PZT.…”

“…An electric field E applied to the composite produces a mechanical deformation in the ferroelectric that in turn is coupled to the ferrite, resulting in a shift δH E in the resonance field. Information on the nature of ME coupling could therefore be obtained from data on shift δH E vs E. [9][10][11][12][13] Such measurements of course require composites with low line width ferromagnetic phases such as yttrium iron garnet (YIG). Studies on bulk polycrystalline samples of 90 wt.% YIG -10% PZT revealed weak ME interactions because of low PZT concentration.…”

Large magnetoelectric susceptibility: The fundamental property of piezoelectric and magnetostrictive laminated composites

“…However, subsequent measurements have ignored the study of ␣ me , and rather focused on ␣ ME ,-which is unfortunate, as ␣ me is the fundamental ME parameter ͑analogous to dielectric constant and magnetic permeability͒, whose understanding is essential to the design devices such as gyrators 18 and E-field tunable microwave dielectric resonators. 19,20 In this letter, we will report investigations of the ME susceptibility for various ME composites, which will reveal that the fundamental parameter ␣ me is on the order of 10 −7 s / m, which is ϳ10 5 times larger than that of Cr 2 O 3 crystals.…”

Geomagnetic sensor based on giant magnetoelectric effect

“…However, since 2001, laminated composites, such as magnetostrictive Terfenol-D or ferrite layers epoxied together with Pb͑Zr 1−x ,Ti x ͒O 3 ͑PZT͒ ones, [12][13][14][15][16][17] have been found to possess giant ME effects of between 0.1 and 2 V / cm Oe under dc magnetic bias of H dc Ͻ 500 Oe. Furthermore, "even larger giant" ME coefficients of up to 22 V / cm Oe under H dc Ͻ 5 Oe have recently been reported for Metglas/PZT-fiber laminates at quasistatic frequency, 18 which is Ͼ10 times larger than prior reports for laminates [12][13][14][15][16][17] and Ͼ10 4 times larger than that of single phases. 11 In this letter, we will show by using a Metglass/PZT-fiber ME sensor that we can precisely detect both geomagnetic fields and their inclinations along various axes of a globe.…”