Download Structures of permanent magnets : generation of uniform by Manlio G. Abele PDF

By Manlio G. Abele

Commences with a evaluation of the elemental techniques of magnetostatics and the research of recommendations to difficulties in easy geometrics, by means of the layout of magnetic buildings. The 3rd part analyzes significant features of the magnetic buildings and demagnetization houses of exact magnetic fabric. deals a couple of sensible makes use of for everlasting magnets, quite to Magnetic Resonance Imaging and in addition contains commercial equipment, excessive strength accelerators and loose electron lasers.

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Possibly applicable methods of directly measuring the current-driven torque have appeared recently in two reports: A. A. Tulapurkar et al28 use an external field to orient the two magnetic moments at an angle of 30◦ . The torque created by an AC current flowing through the junction causes the free moment to oscillate. A voltmeter detects the DC magnetoresistive voltage proportional, by virtue of non-linearity, to the square of the oscillation amplitude. V. C. Sankey et al29 similarly use currentdriven torque to drive ferromagnetic resonance in the free magnet.

The previous two Sections assume the tunneling is elastic. Here we take advantage of the more general nature of the relations derived there. Our present model,30 includes inelastic as well as elastic mechanisms of spin-polarized tunneling. It is inspired in part by awareness of conductance data for Fex Co y Bz /MgO/ Fex Co y Bz of the sort shown in Fig. 14. 4 V (V) Figure 14. Measured conductance versus voltage for an MTJ having a very large MR. The parallel conductance G P lies above, the antiparallel G AP below.

14 JOHN SLONCZEWSKI this impact depth d, as for the monodomain treated in Sec. 6 the reaction of this precession communicates to the magnet the net of the s components transverse to M of all of the electrons passing through the I/F interface into the magnet F. It follows also that the reactive momentum impulse given to F acts essentially at the interface and lies within the M − s plane determined by the incident electrons. Crucial is the principle of conservation of spin momentum which follows from absence of spin operators in the N -electron hamiltonian for a solid: H= i pi2 + 2m i< j e2 − |ri − r j | i,l e2 Z l .

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