Magnetoresistance and magnetic breakdown phenomenon in amorphous magnetic alloys
Transverse magnetoresistance in amorphous magnetic alloys (Fe/sub 1-//sub x/CO/sub x/)/sub 82/Cu/sub 0.4/Si/sub 4.4/B/sub 13.2/ were measured at room temperature and in the magnetic field range 0--15 kOe. For large magnetic field, three different functional dependences of magnetoresistance on magnetic field strength have been found as follows: (1) ..delta..rho/rho approaches saturation. (2) ..delta..rho/rho increases proportionally to H/sup 2/. (3) For x = 0.15, a sharp ..delta..rho/rho peak appears at a certain magnetic field strength in spatial angular orientation of both magnetic field and electric currents. Case (3) is a magnetic breakdown phenomenon. Magnetic breakdown occurs at the gap between the spin-up and spin-down sheets of the Fermi surface. This gap is the spin-orbit gap and its magnitude is a sensitive function of magnetization. Hence the magnitude and width of the magnetoresistance peak and the magnetic field strength at the peak point are functions of angular orientation of both magnetic field and electric current.
- Research Organization:
- Department of Physics, University of Science and Technology of China, Hefei
- OSTI ID:
- 6728521
- Journal Information:
- Chin. Phys.; (United States), Journal Name: Chin. Phys.; (United States) Vol. 8:4; ISSN CHPHD
- Country of Publication:
- United States
- Language:
- English
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