APPLICATIONS OF AMORPHOUS MAGNETIC-LAYERS IN SURFACE-ACOUSTIC-WAVE DEVICES

被引:56
作者
WEBB, DC
FORESTER, DW
GANGULY, AK
VITTORIA, C
机构
[1] Naval Research Laboratory, Washington
关键词
D O I
10.1109/TMAG.1979.1060442
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper reviews the theory and potential applications of magnetically variable delay lines and oscillators which employ a magnetostrictive film on a piezoelectric surface-acoustic-wave (SAW) substrate. Cases analyzed in detail indicate that the delay change arises mainly from a rotation of the magnetic moment from the films' easy axes toward the applied field direction; thus the interaction is essentially non-dispersive. Use of amorphous metallic-glass overlays is particularly attractive because their high magnetostriction and low magnetic anisotropy makes a relatively large delay variation possible with a small change in bias field. Since the SAW velocity can be changed only by ∼ 1% or less with present film technology, applications are restricted to those where only a small frequency or delay adjustment is required. Two prototype examples are considered in detail—a variable delay line for steering an adaptive array antenna and a tunable resonator oscillator capable of tracking high speed Doppler targets. In both of these examples, the magnetic film/SAW substrate geometry is seen to be an attractive alternative to competitive approaches. © 1979 IEEE
引用
收藏
页码:1410 / 1415
页数:6
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