Topic
Colossal magnetoresistance
About: Colossal magnetoresistance is a research topic. Over the lifetime, 3658 publications have been published within this topic receiving 130104 citations.
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TL;DR: In this paper, the authors report on the fabrication of magnetic sensors based on bulk La 0.67 Sr 0.33 MnO 3 (SV0.33) material and show that the sensors display a maximum sensitivity of ∼200%/T at room temperature within a field range of 1-3mT.
Abstract: We report on the fabrication of magnetic sensors based on bulk La 0.67 Sr 0.33 MnO 3 and La 0.67 Ba 0.33 MnO 3 material. The sensors were characterized at fields of 0–8 T and temperatures of 4.2–300 K. The sensors display a maximum sensitivity of ∼200%/T at room temperature within a field range of 1–3 mT. For the sensor geometry investigated here, the low-field magnetoresistance (MR) of the sensors measured in three field orientations with respect to the sensor plane is strongly anisotropic. The high-field MR, in contrast, is found to be field-orientation independent. Periodic response of the sensor’s resistance to the angle between the field and sensor-plane is demonstrated at room temperature.
51 citations
TL;DR: It is found that frequency mixing effects at very high magnetic fields cannot be explained by the Shoenberg magnetic interaction, but are instead probably caused by oscillations in the chemical potential which become important as the extreme quantum limit is approached.
Abstract: Magnetoresistance measurements carried out in pulsed magnetic fields of up to 60 T and at temperatures down to 350 mK and angle-dependent magnetoresistance experiments performed in quasistatic fields have been used to establish that the charge-transfer salt beta ''-(BEDT-TTF)(2)AuBr2 undergoes a change in electronic structure at similar to 10 T. We propose that this arises due to a field-induced transition between two different spin-density-wave states. Furthermore, at the highest magnetic fields, both the background magnetoresistance and effective masses of the quasiparticles were found to increase, possibly as a result of an enhancement of the density of states. It is found that frequency mixing effects at very high magnetic fields, observed in the Fourier spectra of the magnetoresistance, cannot be explained by the Shoenberg magnetic interaction, but are instead probably caused by oscillations in the chemical potential which become important as the extreme quantum limit is approached.
51 citations
TL;DR: In this article, structural, magnetic and electrotransport properties of as-deposited and annealed (Ni 80 Fe 20 ) χ Ag( 1−χ ) heterogeneous alloys prepared by sputtering are investigated.
51 citations
TL;DR: In this article, La2/3Ca1/3MnO3 was successively implanted with 100 and 200 keV silver ions at fluences of 4.5×1015 and 1×1016 ions/cm2, respectively, to achieve a fairly uniform implant distribution.
Abstract: Epitaxial films of La2/3Ca1/3MnO3 were successively implanted with 100 and 200 keV silver ions at fluences of 4.5×1015 and 1×1016 ions/cm2, respectively, to achieve a fairly uniform implant distribution. The as-implanted films are insulating and do not show a metal–insulator transition. Postimplantation annealing at 950 °C shows a recovery of the high structural quality of the films, along with an increase in the metal–insulator transition temperature (Tp), magnetoresistance, and the peak temperature coefficient of resistance (TCR) at the transition. The peak TCR of 23% for manganite films is clearly significant for bolometric applications.
51 citations
TL;DR: It is shown that ballistic magnetoresistance exhibits universal scaling in atomic or nanometer scale contacts, and the results agree with a theory that takes into account spin-scattering within a magnetic-domain wall.
Abstract: We show that ballistic magnetoresistance exhibits universal scaling in atomic or nanometer scale contacts. Plotting the data as conductance, we find that, if the maximum magnetoconductance is normalized to unity and the conductance is scaled with the conductivity of the bulk material, the data fall in a narrow region, independent of the nanocontact materials, for our four data sets and four from the literature. The results agree with a theory that takes into account spin-scattering within a magnetic-domain wall.
50 citations