AMPLIFIER USING MAGNETORESISTIVE ELEMENT

摘要

An amplifier (170) including a magnetoresistive element (40) having a free magnetization layer (33), a fixed magnetization layer (31) having magnetic moment larger than that of the free magnetization layer and an intermediate layer (32) provided between the free and fixed magnetization layers. A first electrode layer (171) is provided on the side of the free magnetization layer of the magnetoresistive element and a second electrode layer (172) is provided on the side of the fixed magnetization layer of the element. The amplifier further includes a DC bias power source (174) for applying DC bias to the magnetoresistive element and a load resistor (176). The amplifier successively causes changes in the direction of magnetization of the free magnetization layer, and thus the magnetoresistive element shows negative resistance, thereby amplifying an input signal.