Search

The effect of volume expansion on the magnetic properties of Nd[sub 5]Fe[sub 17] is explored using first-principle electronic structure calculations. A volume expansion of 6% increases the magnetization by ∼6% and the average total exchange parameter by ∼34%. As a result, the Curie temperature (T[sub C]) is expected to increase from 509 to 682 K. Therefore, some nonhybridizing interstitial and substitutional impurities should produce a moderate increase in T[sub C] of Nd[sub 5]Fe[sub 17]. The possible interstitial sites are discussed. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]

The net Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between well-separated spin distributions can be mapped onto a RKKY interaction between two point-like effective moments. The effective moments, which a strongly oscillating dependence on the size, shape, and orientation of the spin distribution, are discussed for a variety of microscopic and macroscopic configurations. Particular emphasis is on the relation between RKKY interactions and band-structure Heisenberg exchange constants in itinerant magnets and on two-ion anisotropy contributions to the magnetocrystalline anisotropy of rare-earth ions. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Presents information on a study which investigated the magneto-optical properties of manganese-bismuth doped with chromium. Experimental details; Results and discussion; Conclusions.

Carries out the self-consistent spin-polarized electronic structure calculations to derive the magnetic properties of samarium (Sm)[sub2] iron (Fe)[sub17-x]A[subx]. Application of linear-muffin-tin-orbitals method in the atomic sphere approximation; Magnetization and site decomposed magnetic moment per atom as a function of cell volume for Sm[sub2]Fe[sub17]; Site-protected spin-polarized density of states of Sm[sub2]Fe[sub17] for various Fe sites.

Deals with a study which measured at room temperature the Fe[sup57] Mössbauer spectra of Sm[sub2]Fe[sub17-x]Al[subx]. Background to the study; Experimental procedure; Results and discussion.

Presents a study of the electronic structure and magnetic properties of iron-rich ternary compounds. Electronic structure; Results and discussion; Conclusions.

Presents a study which reported the electronic and magnetic structure and surface reactivity for R[sub2]T[sub14]B compounds. Description of the electronic structure of R[sub2]T[sub14]B crystals; Overview of the representative Auger spectra for the Nd[sub2]Fe[sub14]B surface; Oxidation of rare-earth alloys exposed to ambient atmosphere.

Provides information on a study that examined the electronic structure and Curie temperature of YFe[sub12-x]Mo[subx]N[suby] compounds using photoelectron spectroscopy. Experimental procedure; Results and discussion on the study; Conclusions.

Examines the electronic structures of Sm[sub2]Fe[sub17]N[subx] with photoemission and spin-polarized calculations. Examples of rare-earth permanent-magnetic materials with widespread applications; Description of the samples used in the study; Information on the calculated density of states for the clean and nitrided Y[sub2]Fe[sub17] compounds.

Presents photoemission studies of cobalt- and iron-based compounds with the thorium manganese[sub 12] structure. Details of the experiment; Theory used in the study; Results and discussion.