Spin valve sensors
Spin valve sensors
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DOI：
10.1016/s0924-4247(99)00159-4
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发表时间：
2000-04-01
影响因子：
4.6
通讯作者：
Almeida, N
中科院分区：
文献类型：
--
作者：
Freitas, PP;Silva, F;Almeida, N
本文演示了自旋阀传感器的应用程序作为存储系统中的读取元件，或者，当在惠斯通电桥配置，作为转速控制设备（ABS系统），电力线的高电流监测设备，和定位控制设备在机器人系统。对于记录头，屏蔽的自旋阀传感器对于高线性密度记录是足够的。磁带头被制造为具有每微米磁道宽度400 μ V的输出，具有100 kfci的D50值，以及-0.34 dB/kfci的信号lass。对于旋转速度测量，使用具有通量引导的自旋阀桥传感器，产生400-mVpp的幅度，当被磁化轮激励时，方波输出的上升/下降时间小于70 μ s。振幅与速度（0-3000 rpm）和传感器与车轮的间距（0.5-2.0 mm）无关。对于电力线应用，电流高达2100 A。(at 50 Hz），灵敏度为35 μ Vrms/A，线性偏差为+/-1.5%，在机器人位置控制中，在+/-0.5 mm范围内，最大误差为+/-9 μ m。在最后两种情况下，使用不带磁导的电桥来最大化线性响应。(C)2000年爱思唯尔科学有限公司All rights reserved.
This paper demonstrates spin valve sensor applications as read elements in storage systems, or, when in a Wheatstone bridge configuration, as rotational speed control devices (for ABS systems), high current monitoring devices for power lines, and positioning control devices in robotic systems. For recording heads, shielded spin valve sensors are adequate for high linear density recording, A tape head was fabricated with output 400 mu V per micron of trackwidth, with a D50 value of 100 kfci, and signal lass of -0.34 dB/kfci, For rotational speed measurement, spin valve bridge sensors with flux guides were used, yielding a 400-mVpp amplitude, and square wave output with rise/fall times below 70 mu s, when excited by a magnetized wheel. Amplitude is independent of speed (0-3000 rpm), and of sensor to wheel separation (0.5-2.0 mm). For power line applications, currents up to 2100 A. (at 50 Hz) could be measured with a sensitivity of 35 mu Vrms/A and deviations from linearity of +/- 1.5%, In robot position control, a maximum error of +/- 9 mu m over a +/- 0.5-mm span was obtained. In the two last cases, bridges without flux guides are used to maximize linear response. (C) 2000 Elsevier Science S.A. All rights reserved.