| 摘要 |
A magnetic multilayer film having magnetoresistance (MR) is prepared by depositing at least two magnetic thin films having different coercive forces while interposing a non-magnetic thin film therebetween. A first magnetic thin film having a lower coercive force has a squareness ratio SQ1 and a thickness t1, a second magnetic thin film having a higher coercive force has a squareness ratio SQ2 and a thickness t2, and the non-magnetic thin film has a thickness t3. A first form of the invention requires 4 ANGSTROM </=t2<30 ANGSTROM , 20 ANGSTROM <t1</=200 ANGSTROM , t1>t2, t3</=200 ANGSTROM , 0.7</=SQ1</=1.0, and 0.1</=SQ2</=0.8, thereby achieving a magnetic multilayer film which shows a great MR ratio of several percents under an external magnetic field of several Oe, an excellent rise across zero magnetic field and heat resistance. A second form of the invention requires 4 ANGSTROM <t2<20 ANGSTROM , 5 ANGSTROM <t1</=20 ANGSTROM , t1<t2 and 32 ANGSTROM <t3<50 ANGSTROM , thereby achieving a magnetic multilayer film which is increased in MR ratio, MR slope between -50 Oe and +50 Oe, and high-frequency MR slope while showing minimized hysteresis. There are obtained MR elements, typically high sensitivity MR sensors and MR heads capable of high density magnetic recording.
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