The magnetic properties of the Sherrington-Kirkpatrick model for spin glasses

1980 ◽  
Vol 41 (6) ◽  
pp. 677-680 ◽  
Author(s):  
G. Parisi
Keyword(s):  
Magnetic Properties ◽  
Spin Glasses ◽  
Kirkpatrick Model

Magnetic properties of undoped and Co-doped n-type β–FeSi2.5 single crystals

2002 ◽  
Vol 17 (11) ◽  
pp. 2960-2965 ◽  
Author(s):  
E. Arushanov ◽  
L. Ivanenko ◽  
D. Eckert ◽  
G. Behr ◽  
U. K. Rößler ◽  
...  
Keyword(s):  
Activation Energy ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
External Field ◽  
Single Crystals ◽  
Spin Glasses ◽  
Paramagnetic Centers ◽  
Temperature Dependent ◽  
Paramagnetic Curie Temperature ◽  
Co Doped

Results of magnetization and magnetic susceptibility measurements on undoped and Co-doped FeSi2.5 single crystals are presented. The temperature dependence of the magnetic susceptibility of the Co-doped sample in the range of 5–300 K can be explained by temperature-dependent contributions due to paramagnetic centers and the carriers excited thermally in the extrinsic conductivity region. The values of the paramagnetic Curie temperature and activation energy of the donor levels were estimated. It is also shown that the magnetic susceptibility of Co-doped samples cooled in zero external field and in a field are different. This resembles the properties of spin-glasses and indicates the presence of coupling between magnetic centers.

scholarly journals Some comments on the Sherrington-Kirkpatrick model of spin glasses

1987 ◽  
Vol 112 (4) ◽  
pp. 553-566 ◽  
Author(s):  
J. Fröhlich ◽  
B. Zegarlinski
Keyword(s):  
Spin Glasses ◽  
Kirkpatrick Model

Organic-Based Magnets: Opportunities in Photoinduced Magnetism, Spintronics, Fractal Magnetism, and Beyond

MRS Bulletin ◽  
2003 ◽  
Vol 28 (7) ◽  
pp. 492-499 ◽  
Author(s):  
Arthur J. Epstein
Keyword(s):  
Magnetic Properties ◽  
Organic Semiconductors ◽  
Spin Glasses ◽  
Molecular Design ◽  
Magnetic Ordering ◽  
Research Society ◽  
Spin Polarized ◽  
Materials Research ◽  
Photoinduced Magnetism ◽  
New Phenomena

AbstractThis article is based on a presentation on organic-based magnets given as part of Symposium X—Frontiers of Materials Research on December 4, 2002, at the 2002 Materials Research Society Fall Meeting in Boston. The advent of organic-based magnets opened the opportunity for tuning magnetic properties by molecular design and the discovery of new phenomena that rely on the internal structure of the molecules that make up these magnets. In the past 18 years, numerous classes of organic-based ferromagnets, ferrimagnets, and spin glasses (spins essentially frozen in place without long-range order) have been reported. These materials have magnetic ordering temperatures ranging from <1 K to above room temperature and demonstrate many of the magnetic properties associated with conventional magnets. This article concentrates on new phenomena that are unique to organic-based magnets. Three of these effects—“high-temperature” light-induced magnetism, spin-polarized magnetic organic semiconductors with the potential for spintronics, and the development of fractal magnetic order—are discussed to illustrate the richness of opportunity in organic-based magnets.

Magnetic Properties of Amorphous Fe2O3-R2O3 (R=La, Gd and Tb) Thin Films Fabricated by Sputtering Method

2008 ◽  
Vol 39-40 ◽  
pp. 207-212 ◽  
Author(s):  
Hirofumi Akamatsu ◽  
Shunsuke Murai ◽  
Koji Fujita ◽  
Katsuhisa Tanaka
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Spin Glasses ◽  
Magnetic Moments ◽  
Rare Earth Ions ◽  
Aging Effects ◽  
Glass Substrates ◽  
Radio Frequency Sputtering ◽  
Magnetic Aging ◽  
Temperature Dependences

Amorphous oxide thin films of Fe2O3-R2O3 (R = La, Gd and Tb) systems have been deposited on silica glass substrates by using a radio frequency sputtering method, and magnetic properties of the thin films have been examined. The Fe2O3-La2O3 thin films exhibit cusp-like maxima of dc magnetic susceptibility in their temperature dependences as well as magnetic aging and memory effects characteristic of typical spin glasses. For Fe2O3-Gd2O3 and Fe2O3-Tb2O3 systems, magnetic moments of iron ions take part in formation of a spin glass state, as indicated by the magnetic aging effects, while those of rare-earth ions remain to be in a paramagnetic state even at very low temperatures.

scholarly journals SPETTROSCOPIA MUONICA: UNA SONDA MICROSCOPICA PER IL MAGNETISMO

2014 ◽  
Author(s):  
Samuele Sanna
Keyword(s):  
Magnetic Properties ◽  
Spin Glasses ◽  
Condensed Matter ◽  
Dynamic Processes ◽  
Elementary Level ◽  
Neutral Particles ◽  
Diffusion Phenomena ◽  
Properties Of Materials ◽  
And Diffusion ◽  
Physical Principles

The muon spectroscopy is an experimental technique which employs muon beams to study the properties of condensed matter. In particular, it allows us to study static and dynamic processes in magnetic materials (e.g. iron magnets/antiferromagnets, spin glasses, frustrated, etc) and superconductors, as well as chemical reactions and diffusion phenomena of charged and neutral particles. Here we will describe at the elementary level the physical principles of this technique, highlighting especially the use in the microscopic study of the magnetic properties of materials.

On the Sherrington-Kirkpatrick Model of Spin Glasses

2002 ◽  
pp. 55-63
Author(s):  
Erwin Bolthausen ◽  
Alain-Sol Sznitman
Keyword(s):  
Spin Glasses ◽  
Kirkpatrick Model
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