Effect of spin-polarized injection on the mixed state of YBa[sub 2]Cu[sub 3]O[sub 7-δ]

Mikheenko, P.; Colclough, M. S.; Severac, C.; Chakalov, R.; Welhoffer, F.; Muirhead, C. M.
January 2001
Applied Physics Letters;1/15/2001, Vol. 78 Issue 3, p356
Academic Journal
We report measurements of the magnetic moment of YBa[sub 2]Cu[sub 3]O[sub 7-δ] films when subjected to injection of short pulses of spin-polarized current from the colossal magnetoresistance (CMR) manganites La[sub 0.7]Ca[sub 0.3]MnO[sub 3] and La[sub 0.7]Sr[sub 0.3]MnO[sub 3], and unpolarized current from the nonmagnetic perovskite LaNiO[sub 3](LNO). We study relaxation from the Bean critical state, with and without current pulses. For pulses longer than 100 ms, the effect of injection is similar for all samples and is due to heating. Below 1 ms, we see a clear difference between the CMR and LNO samples and attribute this to the spin polarization of the current injected from the CMR materials. © 2001 American Institute of Physics.


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