We have measured the anisotropic magnetoresistance of Fe films exchange coupled to antiferromagnetic MnF2 layers. Exchange bias and coercivity obtained from magnetoresistance are in close agreement with superconducting quantum interference device magnetometry data. In addition the magnetoresistance reveals an asymmetry in the magnetization reversal process, despite the fact that the magnetizati...

Using a patterned hcp @Co ~17 Å!/Re (7Å)]20 antiferromagnetically coupled superlattice, with the c axis in the film plane, magnetoresistance ~MR! measurements were made in the temperature range between 5 K and room temperature. The MR was simulated and decomposed into its anisotropic magnetoresistance ~AMR! and giant magnetoresistance ~GMR! components using the magnetization as a function of an...

The electronic structure basis of the extremely large magnetoresistance in layered nonmagnetic tungsten ditelluride has been investigated by angle-resolved photoelectron spectroscopy. Hole and electron pockets of approximately the same size were found at low temperatures, suggesting that carrier compensation should be considered the primary source of the effect. The material exhibits a highly a...

The magnetoresistance across interfaces in the itinerant ferromagnetic oxide SrRuO3 have been studied. To define appropriately the interfaces, epitaxial thin films have been grown on bicrystalline and laser-patterned SrTiO3 substrates. Comparison is made with results obtained on similar experiments using the doubleexchange ferromagnetic oxide La2/3Sr1/3MnO3. It is found that in SrRuO3, interfac...

Astronomy of the Russian Academy of Sciences was held on 28th January 1998 at the P L Kapitza Institute for Physical Problems, RAS. The following reports were presented at the session: (1) Nagaev E L (Institute for High-Pressure Physics of RAS) ``Magnetoimpurity theory of colossal magnetoresistance materials''; (2)Bonch-BruevichAM,VartanyanTA,Przhibel'ski|̄SG, Khromov V V (S I Vavilov State Opti...

We have studied the magnetoresistance of single-crystalline 001 Fe films prepared by sputtering techniques and covered by epitaxial MgO or Pt protective layers. The influence of the thickness of the magnetic layer as well as of the nature of the capping layer on the Fe anisotropic magnetoresistance was investigated by four-terminal probe, measurements performed with the current J in the 110 mag...

We predict that an unconventional guiding center (GC) motion yields a new mechanism for linear and non-saturating (transverse) magnetoresistance in 3D metals. Our theory is semi-classical and applies in the regime where the transport time is much greater than the cyclotron period, and for weak disorder potentials which are slowly varying on a length scale much greater than the cyclotron radius....

Besides the ‘‘intrinsic’’ colossal magnetoresistance effect observed in single crystals, the polycrystalline manganate compounds also exhibit an ‘‘extrinsic’’ magnetoresistance related to the presence of grain boundaries. We report electrical transport and magnetic measurements carried out on a bigrain sample extracted from a floating zone method-grown rod of calcium doped lanthanum manganate. ...

We report magnetoresistance (MR) manipulation and sign reversal induced by carrier concentration modulation in Mn-doped ZnO nanowires. At low temperatures positive magnetoresistance was initially observed. When the carrier concentration was increased through the application of a gate voltage, the magnetoresistance also increased and reached a maximum value. However, further increasing the carri...

We report light-induced negative organic magnetoresistance (OMAR) measured in ambient atmosphere in solution-processed 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) planar hybrid devices with two different device architectures. Hybrid electronic devices with trench-isolated electrodes (HED-TIE) having a channel length of ca. 100 nm fabricated in this work and, for comparison, com...