The change of magnetoresistance peaks according to the direction of samplerelative to the magnetic field

The change of magnetoresistance (MR) peaks according to the direction of th e film sample relative to the magnetic field has been investigated for vari ous angle configurations of the sample relative to the field. When the samp le is in the same plane as that of the magnetic Aux, the MR peaks are found to change their shapes, as the sample is rotated through an axis perpendic ular to:the sample surface, and finally to show their minima at the rotatio n angle of 45 degrees. However, if the sample is inclined relative to the f ield, the MR peaks show their minima at a rotation angle higher than 45 deg rees. This behavior can be explained by the mixing of the negative MR (NMR) and positive MR (PMR) signals in MR. Furthermore, we also observe the incr ease of the magnetic field difference between two MR peaks (FDMP) as a func tion of the rotation angle, phi, for the angle configuration of the sample perpendicular to the field. This increase in FDMP is fitted well as a funct ion of 1/ cos phi, which is well explained by the concept of the effective magnetic field.