Download Thin Film Magnetoresistive Sensors by S Tumanski PDF
By S Tumanski
A finished evaluate of skinny movie magnetoresistive (MR) sensors, together with the speculation of magnetoresistive results in addition to the layout, fabrication, homes and functions of MR sensors.
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Additional info for Thin Film Magnetoresistive Sensors
Sample text
Every time the magnetic field vector reaches its critical value the vector of magnetization jumps to the opposite direction. 22 Graphical method of determination the transfer characteristic ⌬Rx ϭ f(hx) for the external field inclined by the angle 45° to the anisotropy axis. PART 1 9/5/01 9:22 pm 26 Page 26 THIN FILM MAGNETORESISTIVE SENSORS The experiments confirm the results of graphical determination of the resistance by means of the Stoner and Wohlfarth model. 23 presents a comparison of theoretical and experimental investigations for varying component hy and fixed component hx.
Additionally the magnetic history should be taken into account (Corb 1988). Yan and Jurisch (1989) computed the closure domain patterns for some simplified conditions – starting from an assumed initial domain configuration. 37(a) shows the results of calculations of the domain pattern. 37 The magnetization distribution in small permalloy sensors: calculated by Yan and Jurisch 1989(a) and by Köhler et al 1993(b,c). PART 1 9/5/01 9:23 pm Page 37 AMR SENSORS 37 A micromagnetic simulation program to compute the magnetization patterns in small thin film elements has been proposed by Köhler (Köhler et al 1993).
Next the angles and can be determined. 35). 6. 20 presents the reverse situation – varying of the Hy component. When the magnetic field hy decreases from hy1 to hy2 there is a moment when hy reaches the critical value hyc. At this moment the direction of the magnetization suddenly changes. When the magnetic field again increases the change of resistance has another character – the full cycle of magnetization makes the hysteresis loop. 21). In this way “the magnetic history” of the thin film has been changed.