R. Mallik et al., LARGE POSITIVE MAGNETORESISTANCE AT LOW-TEMPERATURES IN A FERROMAGNETIC NATURAL MULTILAYER, LAMN2GE2, Applied physics letters, 71(16), 1997, pp. 2385-2387
The results of magnetoresistance measurements on a naturally occurring
multilayer LaMn2Ge2, which is ferromagnetic below 326 K, are reported
. The magnitude of magnetoresistance is found to be positive below 70
K gradually increasing to an unusually large value (nearly 100%) at 4.
2 K in the presence of a field of 70 kOe as the temperature is lowered
, similar to the recent observations by Verbanck, Temst, Mae, Schad, V
an Bael, Moshchalkov, and Bruynseraede [Appl. Phys. Lett. 70, 1477 (19
97)] in Cr/Ag/Cr trilayers. The positive sign of magnetoresistance for
a ferromagnet is unexpected and possible explanations are offered. (C
) 1997 American Institute of Physics.