Magnetism magnetoresistance

Measurements of the magnetization, magnetoresistance and Hall effect have been carried out on the TbNiSn and DyNiSn single crystals under a magnetic field up to 8 T at 1.4 K by Furusawa et al. (1995). A multistep magnetization process was observed. The magnetoresistance in both compounds shows a complicated variation under magnetic field which is associated with spin fluctuations. 

Fig. 94. Proposed magnetic phase diagram of orthorhombic NdCuj along the b axis, deduced from magnetization, magnetoresistance and specific heat measurements. A, antiferromagnetic phases F, ferrimagnetic phases P, paramagnetic phases. (After Svoboda et al. 1992.)...

Special applications, such as in high-magnetic fields, require special thermometers. The carbon-glass and strontium-titinate resistance thermometers have the least magnetoresistance effects. 

Key Words—Carbon nanotubes, scanning tunneling microscopy, spectroscopy, magnetoresistance, electrical resistivity, magnetic susceptibility. 

Song et al. [16] reported results relative to a four-point resistivity measurement on a large bundle of carbon nanotubes (60 um diameter and 350 tm in length between the two potential contacts). They explained their resistivity, magnetoresistance, and Hall effect results in terms of a conductor that could be modeled as a semimetal. Figures 4 (a) and (b) show the magnetic field dependence they observed on the high- and low-temperature MR, respectively. 

Fig. 6. The magnetic field dependence of the magnetoresistance at different temperature for the same microbundle measured in Fig. 5 (after Langer et aL[ 9 ).

ELECTRICAL CONDUCTIVITY OF INHOMOGENEOUS SYSTEMS APPLICATION TO MAGNETIC MULTILAYERS AND GIANT MAGNETORESISTANCE... 

Luo et al. [1,153] used a slurry containing ultra-fine diamond (UFD) powders to polish the surface of HDD sliders. The powders are from 3 nm to 18 nm in diameter and 90 % around 5 nm. They are crystal and sphere-like [154]. The pH value of the slurry is kept in the range from 6.0 to 7.5 in order to avoid the corrosion of read-write heads, especially pole areas. A surface-active agent is added into the slurry to decrease the surface tension of the slurry to 22.5 Dyn/cm, and make it spread on the polish plate equably. An anti-electrostatic solvent is also added to the slurry to avoid the magnetoresistance (MR) head being destroyed by electrostatic discharge. The anion concentration of the slurry is strictly controlled in ppb level so as to avoid the erosion of magnetic heads as shown in Table 5. The concentration of UFDs in the slurry is 0.4 wt %. 

---