TY - CHAP
T1 - New Developments with Magnetic Tunnel Junctions
AU - Brückl, Hubert
AU - Thomas, Andy
AU - Schotter, Jörg
AU - Bornemeier, Jan
AU - Reiss, Günter
PY - 2003/7/29
Y1 - 2003/7/29
N2 - Besides sensors, magnetic random access memory (MRAM) and hard disk read heads, much more possible applications are still ahead for the new magnetoelectronic effects of magnetic tunnel junctions (MTJs), e.g. in logic or biochips. While the technology has improved within the recent years, the reliable fabrication of MTJs with magnetoresistance ratios of up to 50% at room temperature made it possible to extend the efforts towards new developments. Thus, MTJs with two or more barriers in the film stack provide both the realization of new devices like multivalent logic and the improvement of the bias stability and magnetoresistance ratio at larger voltages. The influence of ballistic effects, resonant states and spin accumulation are experimentally investigated and estimated by numerical solution of the Schrödinger equation for double barrier systems. Besides new applications in logic devices, MTJs are promising sensors for magnetoresistive biochips, which are capable to detect even single molecules like DNA by functionalized magnetic markers. The principle and design of magnetoresistive biochips are presented, and their performance compared to the established fluorescent method.
AB - Besides sensors, magnetic random access memory (MRAM) and hard disk read heads, much more possible applications are still ahead for the new magnetoelectronic effects of magnetic tunnel junctions (MTJs), e.g. in logic or biochips. While the technology has improved within the recent years, the reliable fabrication of MTJs with magnetoresistance ratios of up to 50% at room temperature made it possible to extend the efforts towards new developments. Thus, MTJs with two or more barriers in the film stack provide both the realization of new devices like multivalent logic and the improvement of the bias stability and magnetoresistance ratio at larger voltages. The influence of ballistic effects, resonant states and spin accumulation are experimentally investigated and estimated by numerical solution of the Schrödinger equation for double barrier systems. Besides new applications in logic devices, MTJs are promising sensors for magnetoresistive biochips, which are capable to detect even single molecules like DNA by functionalized magnetic markers. The principle and design of magnetoresistive biochips are presented, and their performance compared to the established fluorescent method.
U2 - 10.1007/978-3-540-44838-9_28
DO - 10.1007/978-3-540-44838-9_28
M3 - Chapter
SN - 1438-4329
T3 - Advances in Solid State Physics
SP - 397
EP - 412
BT - Advances in Solid State Physics
ER -