E Book Spin Electronics

E Book Spin Electronics


E Book Spin Electronics
E Book Spin Electronics








Author(s): J. F. Gregg (auth.), Michael Ziese, Martin J. Thornton (eds.)
Series: Lecture Notes in Physics 569
Publisher: Springer Berlin Heidelberg, Year: 2001
ISBN: 3540418040,9783540418047


Describe:


For 50 years, traditional electronics have ignored the electron's rotation.
The processing and use of electron rotation heralds an exciting and rapidly 
changing era in electronics, combining magnetic specialties and traditional electronics. 
The first generation of "spintronic" devices (such as giant magnetic resistance reading heads or non-volatile Random Access Memory) have already gained dominant positions in the market. This volume, the first of its kind in Spin Electronics, describes all the major topics for new researchers entering the field. It covers the basics of magnetism, semiconductors, micromagnetism, experimental techniques, materials science, instrument manufacturing, and new developments in rotational processes. At the end of most chapters there are a number of exercises and problems that have worked to help the reader understand this wonderful new field.



1 Introduction to Spin Electronics

1.1 Lima Li

The driving force behind Spin Electronics has been neatly summed up in J.M.D.
Coye's conclusive observation [1] that "traditional electronics have been ignored The electron spins. "On every Hi-Fi radio, 50% of the electrons are connected Tends to spin and the rest spins down (where it connects up and down For some locally induced quantization hubs in wires and related devices).

However, although the electron spin was known for most of the twentieth century, no The technique is used from this fact.

1.2 Two-channel model

The mechanical foundation of Spin Electronics is outdated providing a concept concept The electron spins itself. In the mid-1930s, the death of [2] hypothesized that some anomalies in electrical transport in the behavior of metal magnets arose from The ability to consider two spin and spin conduction electrons Independent families of shipping companies, each with its own transportation characteristics.

Basically a death hypothesis is that the rare scattering circulation is rare enough On a time scale of all other dispersion operations that are essential to the problem Overruns from one channel to another may be ignored, therefore The relative independence of the two channels [3,4,5].

1.2.1 Inconsistency of rotation

Another necessary component of this model is that my spinning families contribute completely differently to electric transmissions.
This may be due The number densities differ for each vector type, or perhaps for it They have different movements - in other words, that same momentum or energy The dispersion mechanisms treat them very differently. 
Either way, the contrast This makes spinning electrons behave differently with spinning electrons Because the iron magnetic exchange field divides the spin and woven conduction bands, leaving different concentrations visible on the Fermi surface.

If the intensity of the states of the electron varies on a Fermi surface, it is clear that The number of electrons involved in the conduction process varies for each Spin channel. However, more precisely, different densities of states are rotatable and Down rotation means that the two types of rotation are dispersible Different, which in turn leads to the possession of different movements.

1.2.2 Accumulation of rotation

Let's think of two channels spinning with a different movement (Figure 1.1). When
The electric field is applied to the metal, there is a shift, ∆k, in the momentum area
Fermi spin-up and spin-down surfaces according to the formula:

F = eE = dk
dt = ∆k

Where F is the force on the carrier, E is the electric field, e is the electronic charge, τ is the electron
The scattering time is given by µ = eτ / m ∗, µ being the motion of the electron and m 
The effective electron mass. Since the channels have different movements, this shift is
Different for woven and low fermi surfaces as shown.




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