PURPOSE: To enhance the magnetic field sensitivity while reducing the hysteresis by a method wherein the coersive force of adjacent magnetic thin film are changed from one another through the intermediary of non-magnetic thin films.
CONSTITUTION: The coersive forces of adjacent magnetic thin films M1, M2, Mn-1, Mn-2 throught the intermediary of non-magnetic thin films N1, N2, Nn-2, Nn-1 are changed from one another while securing the thickness of the first magnetic thin films M1, Mn-1 having small coersive force, the thickness of the second magnetic thin films M2, Mn-2 having large coersive force and the thickness of the non-magnetic thin films N1, N2, Nn-2, Nn-1 respectively to be t1, t2 and t3, 4<t2<20, 5<t1≤20, t1<t2, 32<3t<50. On the other hand, the squareness ratio of the first magnetic thin films M1, Mn-1 having small coersive force is to be 0.7-1.0 while that of the second magnetic thin films M2, Mn-2 having large coersive force is to be 0.1W0.8. Through these specifications, the large gradient of the magnetoresistive variation within the magnetic field range of -500e-+500e, the high magnetic sensitivity and the reduced hysteresis can be assured.
MIYAUCHI DAISUKE
SHINOURA OSAMU
