Magnetization direction

In a selective-inversion experiment, it is the relaxation of the z magnetizations that is being studied. For a system without scalar coupling, this is straightforward a simple pulse will convert the z magnetizations directly into observable signals. For a coupled spur system, this relation between the z magnetizations and the observable transitions is much more complex [22]. 

Here p and pj are the transverse and longitudinal resistivities with respect to the magnetization direction, respectively. The off-diagonal element pn represents the spontaneous or anomalous Hall resistivity (AHR) [3]. Conventionally, the anisotropy of the resistivity is expressed by the SMA ratio... 

Figure 4-218. Sketch of the principle of the sensor arrangement in a steering tool and any magnetic directional tool. (Courtesy SPE...

Gyroscopic survey A directional survey conducted using a gyroscope for directional control, usually used where magnetic directional control cannot be obtained. 

Monel (K monel) A permanently nonmagnetic alloy used in making portions of downhole tools in the bottomhole assembly (BHA) where the magnetic survey tools are placed for obtaining magnetic direction information. Monel refers to a family of nickel-copper alloys. 

EuIn2P2 magnetic susceptibility shows a clear magnetic transition at about 24 K. In Fig. 11.5 c, magnetic susceptibility as a function of the a, a-h, and c direction were obtained on a plate crystal. The a axis exhibits the largest susceptibility and is the easy magnetization direction. The c axis is the hard magnetization direction. 

Based on the right-hand thumb rule described in the text, and assuming that only an equilibrium magnetization directed along the z-axis exists, draw the positions of the magnetization vectors after the application of ... 

Longitudinal magnetization This is the magnetization directed along the z-axis parallel to the Bq field. 

Mossbauer spectroscopy has been extensively used for studies of nanostructured materials and several reviews on magnetic nanoparticles have been published, see e.g. [6-8, 46 8]. The magnetic properties of nanoparticles may differ from those of bulk materials for several reasons. The most dramatic effect of a small particle size is that the magnetization direction is not stable at finite temperatures, but fluctuates. 

For fiB 2KV, there is only one energy minimum, i.e. there is no energy barrier between different magnetization directions [57], and the fluctuations of the magnetic hyperfine field can therefore be considered fast compared to Tm- The induced magnetic hyperfine field is then proportional to the induced magnetization. Using... 

The fluctuations of the magnetization direction around an easy axis, known as collective magnetic excitations, can be considered fast compared to the time scale of Mossbauer spectroscopy because there are no energy barriers between magnetization directions close to an easy direction, and the magnetic splitting in the... 

Figure 6. Predicted and experimental Mossbauer spectra for a magnetized Co in a-iron source at room temperature and a single crystal of Ca2lFe ](Fe)Os. Crystallographic b axis of Ca2lFeVFe)Og and magnetization direction of source are parallel ana perpendicular to the y-ray propagation direction, respectively.

In Fig. 11 the change in the junction resistance (at 2 mV) is plotted as an external magnetic field which goes from 1,500 to —1,500 Oe (circles) and is then reversed from —1,500 to 1,500 Oe (triangles) with the sample held at 80 K. When the magnetic field is between 20 and 200 Oe, the magnetization direction of the LSMO layer becomes antiparaUel to the Co layer. Using the conventional definition of MR, defined as AR/R p = (Rap p)/ ap> where Rap is the junction resistance in... 

The values of, 3C T1 and their temperature dependence are found to be very sensitive to the nature of the build-up of the carbon magnetization directly (by applying a 90° degree pulse), or indirectly by cross-polarization. The 13Clfi vs. 

Although these quantities do not enter the expression for magnetization directly, one needs them to proceed to the next order. 

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