Measuring the momentum distribution of the unpaired spin electrons in ferromagnets using synchrotron radiation

Conference · Thu Dec 01 00:00:00 EST 1988

OSTI ID:6782519

Mills, D M

The dominant term in the x-ray Compton cross-section of an electron is the interaction of the photon and the electron's charge. Platzman and Tsoar many years ago pointed out that there is also an interaction between an x-ray and the electron's spin and in principle this interaction can give information on the momentum distribution of the unpaired spin electrons in the solid. Unfortunately, the spin sensitive term is not only small compared to the charge term, but in addition couples to the photons in first order only with that components of the x-ray beam that is circularly polarized. A lack of intense sources of circularly polarized x-rays combined with the relative small size of the spin sensitive term makes measurements of the momentum distributions of unpaired spin electrons difficult, resulting in little experiment progress initially made in spin or magnetic Compton scattering. In the past several years, interest in spin sensitive Compton scattering has been revived due in large part to the availability of intense beams of high energy photons from synchrotron radiation sources. The radiation from storage ring sources has well defined polarization states; highly linearly polarized in the orbital plane and elliptically polarized above and below the plane of the orbit of the circulating particles. The high flux and unique polarization properties of synchrotron radiation sources have greatly facilitated measurements of the momentum distributions of the unpaired spin electrons in ferromagnetic solids. Recent results of the work of several groups will be presented, along with some thoughts on the impact that the next generation of storage rings, such as the Advanced Photon Source, and insertion devices specifically designed to produce circularly polarized x-ray beams will have on the field of magnetic Compton scattering. 21 refs., 6 figs.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6782519
• Report Number(s): CONF-8808141-9; ON: DE89005864
• Resource Relation: Conference: 3. international conference on synchrotron radiation instrumentation, Tokyo, Japan, 29 Aug 1988; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
47 OTHER INSTRUMENTATION
ELECTRONS
LINEAR MOMENTUM
MEASURING METHODS
COMPTON EFFECT
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION FUNCTIONS
EXPERIMENTAL DATA
FERROMAGNETIC MATERIALS
MATRIX ELEMENTS
SCATTERING
SPIN ORIENTATION
STORAGE RINGS
SYNCHROTRON RADIATION
X-RAY DIFFRACTION
X-RAY SOURCES
BASIC INTERACTIONS
BREMSSTRAHLUNG
COHERENT SCATTERING
CROSS SECTIONS
DATA
DIFFRACTION
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
EQUIPMENT
FERMIONS
FUNCTIONS
INFORMATION
INTERACTIONS
LEPTONS
MAGNETIC MATERIALS
MATERIALS
NUMERICAL DATA
ORIENTATION
RADIATION SOURCES
RADIATIONS
X-RAY EQUIPMENT
656002* - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)
440300 - Miscellaneous Instruments- (-1989)