Magnetization and magnetoresistance have been measured in insulating antiferromagnetic La2Cu0.97Li0.03O4 over a wide range of temperatures, magnetic fields, and field orientations. The magnetoresistance step associated with a weak ferromagnetic transition exhibits a striking nonmonotonic temperature dependence, consistent with the presence of Skyrmions.

The magnetoresistance of classical two-dimensional electrons scattered by randomly distributed impurities is investigated by numerical simulation. At low magnetic fields, we find for the first time a negative magnetoresistance proportional to |B|. This unexpected behavior is shown to be due to a memory effect specific for backscattering events, which was not considered previously.

In today’s world of portable, high capacity music players and consumer hard drives with storage sizes of up to a terabyte, the ubiquitousness of information and the space to store it seems to be almost taken for granted in our society. However, the emergence of such vast and economical storage of data has only occurred within the past 10 years. The most prominent driving force of this technolog...

Colossal magnetoresistance (CMR) effect was discovered among the manganese oxide class of materials, i.e. La1−xCaxMnO3. It shows large magnetoresistance by orders of magnitude, however several environmental requirements limit CMR toward general applications. Recently people have been focused on understanding a fundamental physics because of complex correlations between electron-lattice and elec...

We report results of specific heat measurements from 5 to 70 K on thin films of the giant negative magnetoresistive spin glass a-GdxSi12x and its nonmagnetic analog a-YxSi12x . The specific heat of a-GdxSi12x samples is significantly greater than that of a-YxSi12x samples below 50 K. The resulting magnetic entropy of a-GdxSi12x exceeds the total calculated entropy available from Gd moments alon...

We report the observation of an anomalous magnetoresistance in extremely dilute quasi-one-dimensional AuFe wires at low temperatures, along with a hysteretic background at low fields. The Kondo resistivity does not show the unitarity limit down to the lowest temperature, implying uncompensated spin states. We suggest that the anomalous magnetoresistance may be understood as the interference cor...

In the present work we focus on the study of the temperature dependence of the tunnelling current in a ferromagnetic Zener diode. We predict the tunneling magnetoresistance dependence on the temperature. Large doping concentrations lead to magnetic semiconductors with Curie temperature TC near or over room temperature and this will facilitate the introduction of new devices that make use of the...

We review recent experimental work falling under the broad classification of colossal magnetoresistance (CMR), which is magnetoresistance associated with a ferromagnetic-toparamagnetic phase transition. The prototypical CMR compound is derived from the parent compound, perovskite LaMnO3. When hole doped at a concentration of 20–40% holes/Mn ion, for instance by Ca or Sr substitution for La, the...

The geometric resonance of open orbits in unidirectional lateral superlattices has been examined with high magnetic-field resolution. Magnetoresistance oscillations periodic in 1/B, analogous to the well-known commensurability oscillations but orders of magnitude smaller both in magnitude and in the magnetic-field scale, have been observed superposed on the low-field positive magnetoresistance....

We have performed magnetoresistance and Hall-resistance measurements on low —carrierconcentration n-type samples of Hg076Cdp24Te at millikelvin temperatures. We observe an abrupt rise in the Hall resistance and magnetoresistance at a characteristic field H, which is a significant function of temperature and which allows us to reject magnetic freezeout or localization by disorder as possible mec...