Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 6 December 1996:
Vol. 274. no. 5293, pp. 1698 - 1701
DOI: 10.1126/science.274.5293.1698
Prev | Table of Contents | Next

Reports

Interplane Tunneling Magnetoresistance in a Layered Manganite Crystal

T. Kimura, Y. Tomioka, H. Kuwahara, A. Asamitsu, M. Tamura, Y. Tokura

The current-perpendicular-to-plane magnetoresistance (CPP-MR) has been investigated for the layered manganite, La2-2xSr1+2xMn2O7 (x = 0.3), which is composed of the ferromagnetic-metallic MnO2 bilayers separated by nonmagnetic insulating block layers. The CPP-MR is extremely large (104 percent at 50 kilo-oersted) at temperatures near above the three-dimensional ordering temperature (Tc approx  90 kelvin) because of the field-induced coherent motion between planes of the spin-polarized electrons. Below Tc, the interplane magnetic domain boundary on the insulating block layer serves as the charge-transport barrier, but it can be removed by a low saturation field, which gives rise to the low-field tunneling MR as large as 240 percent.

T. Kimura, Y. Tomioka, H. Kuwahara, A. Asamitsu, M. Tamura, Joint Research Center for Atom Technology (JRCAT), Tsukuba, 305, Japan.
Y. Tokura, JRCAT, Tsukuba, 305, Japan, and Department of Applied Physics, University of Tokyo, Tokyo 113, Japan.

Read the Full Text


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Spontaneous Bubble Domain Formation in a Layered Ferromagnetic Crystal.
T. Fukumura, H. Sugawara, T. Hasegawa, K. Tanaka, H. Sakaki, T. Kimura, and Y. Tokura (1999)
Science 284, 1969-1971
   Abstract »    Full Text »
Enhanced Intergrain Tunneling Magnetoresistance in Half-Metallic CrO2 Films.
H. Y. Hwang and S. Cheong (1997)
Science 278, 1607-1609
   Abstract »    Full Text »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)