[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

We study a class of photonic crystals in which both the dielectric constant e d the magnetic permeability m vary within the crystal. We find that in the case where both e andm have their maximum values in the same material, the photonic band gaps tend to disappear. However, in the opposite case where e andm have their maximum values in different materials, the gaps become wider with maximum gap over midgap frequency as high as 0.8. We also discuss the possibility of designing such photonic crystals with ferrites. @S0163-1829 ~97!06227-9# BRIEF REPORTS

Physical Review B

나노 소재 = Nanomaterials

Materials Research Bulletinについて

Colloidal cobalt-doped TiO2 (anatase) nanocrystals were synthesized and studied by electronic absorption, magnetic circular dichroism, transmission electron microscopy, magnetic susceptibility, cobalt K-shell X-ray absorption spectroscopy, and extended X-ray absorption fine structure measurements. The nanocrystals were paramagnetic when isolated by surface-passivating ligands, weakly ferromagnetic (Ms = 1.5 x 10-3 mB/Co2+ at 300 K) when aggregated, and strongly ferromagnetic (up to Ms = 1.9 mB/Co2+ at 300 K) when spin-coated into nanocrystalline films. X-ray absorption data reveal that cobalt is in the Co2+ oxidation state in all samples. In addition to providing strong experimental support for the existence of intrinsic ferromagnetism in cobalt-doped TiO2, these results demonstrate the possibility of using colloidal TiO2 diluted magnetic semiconductor nanocrystals as building blocks for assembly of ferromagnetic semiconductor nanostructures with potential spintronics applications.

Strong Room-Temperature Ferromagnetism in Co2+-Doped TiO2 made from Colloidal Nanocrystals

Room temperature d0 ferromagnetism, zero dielectric loss and ac-conductivity enhancement in p-type Ag-doped SnO2 compounds

A comprehensive review on recent advancements in d0 ferromagnetic oxide materials

Crystal structure, optical and dielectric properties of Ag:ZnO composite-like compounds

d0 ferromagnetism in non-magnetic element-doped oxide materials has caught the attention of researchers due to their promising application in spintronics devices. In a search of finding novel materials exhibiting d0 ferromagnetism, we have studied the Mg-doped TiO2, i.e., Ti1-xMgxO2 (x = 0, 0.02, 0.04, and 0.06) compounds, synthesized by solid-state reaction route method. Single phase of tetragonal rutile structure is observed by X-ray diffraction (XRD) patterns for all compounds. The samples show uniform morphology with particles size ranging from 150 to 200 nm, as per the scanning electron microscopy observations. The magnetic properties investigation by SQUID magnetometer indicates paramagnetic behavior in undoped TiO2 and 2% Mg-doped TiO2, whereas the Ti0.96Mg0.04O2 compound exhibits ferromagnetism embedded in a paramagnetic phase. However, 6% Mg-doped TiO2 exhibits ferromagnetism with a transition temperature of 180.2 K. Further, magnetization vs. temperature curves measured under zero-field, and field-cooled condition for x = 0.06 sample reveal low-temperature magnetic irreversibility, which can be ascribed to the competing antiferromagnetic and ferromagnetic phases. The hysteresis curve with a coercivity of 6515 Oe at 5 K along with domain wall pinning and zero-field-cooled exchange-bias behavior are observed for x = 0.06 sample from the M–H curves.

Effect of Mg-doping in tailoring d 0 ferromagnetism of rutile TiO 2 compounds for spintronics application

In a quest of enriching the area of d0 magnetism in oxide materials, we have undertaken to study Mg-doped TiO2 compounds. The Ti1-xMgxO2 (x=0, 0.02, 0.04 and 0.06) nanoparticles were prepared by solid-state reaction route. The X-ray diffractions (XRD) patterns of these samples indicate single phase of tetragonal rutile-structure of TiO2. The refinement of the XRD patterns reveals no change in the crystallographic lattice parameters in comparison to pure TiO2 upon Mg doping and it indicates that Mg2+ ions do not enter core grains and form core/shell structure. SEM observations reveal the uniform morphology with nanometric grains in the range of 150-200 nm. The measurement of magnetic properties of these compounds indicates that pure TiO2 and Ti0.98Mg0.02 compounds exhibit paramagnetic behavior and Ti0.96Mg0.04 compound exhibits ferromagnetic (FM) phase superimposed with the dominating paramagnetic phase. However, Ti0.94Mg0.06 compound exhibits ferromagnetic to paramagnetic transition with FM transition temperature of 180.2 K. The measurements of zero field and field cooled magnetization data indicate low temperature magnetic irreversibility for x=0.06 sample and it was attributed to the competing AFM (core) and the FM (shell) interactions. The measurement of hysteresis curves at various temperatures indicates domain wall pinning and an exchange-bias behavior.

d0 Ferromagnetism in Mg-doped Rutile TiO2 Nanoparticles

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