Magnetic properties of Fe doped SiC crystals

Abstract

In this paper we report on the crystal growth and magnetic as well as structural studies of SiC : Fe. SiC crystals were grown by Physical Vapor Transport method. We used Fe enriched source material to dope crystals. The magnetic properties were examined by AC/DC magnetometry. AC magnetic susceptibility as well as DC magnetization measurements revealed ferromagnetic type of magnetic ordering. The structural measurements using powder X-ray diffraction were performed.

Magnetic properties of Mn-doped 6H-SiC

“…A series of SiC:TM ͑TM = Mn, Fe, Co, Cr, etc.͒ have been synthesized and investigated by several research groups. [7][8][9][10][11][12][13][14] For DMSs, such as SiC:TM, there still exist two challenges: ͑1͒ the realization of Curie temperature ͑T c ͒ around or above RT; ͑2͒ whether the obtained material is indeed a solid solution of Si 1−x TM x C or it remains as SiC matrix with embedded TM clusters, precipitates, or second phases that are responsible for the observed magnetic properties. Toward this role, more efforts are required.…”

Structural and magnetic properties of pulsed laser deposited Fe–SiC thin films

“…The coercivity of the as-deposited sample is found to be~2.9 × 10 3 A/m which significantly increases to~11.5 × 10 3 A/m for annealed sample at 1073 K, with increase in annealing temperature from 1073 to 1273 K, it decreases to~5.6 × 10 3 A/m. The low coercivity of as-deposited Fe-SiC thin films ascribed to the amorphous nature [24], while the high coercivity of annealed Fe-SiC thin films (1073 K) may be due to the crystalline nature and formation of Fe 3 Si phase [5,19,[25][26][27]. The decrease in coercivity with increase in annealing temperature may be associated with change in grain size.…”

Structural and magnetic properties of (Al, Fe)-codoped SiC

“…To the best of our knowledge, singlephase Si 1−x Fe x C bulk material has not been obtained until this study. Here, aluminium element is speculated to play the key role of stabilizing the codoped SiC crystal structure as 4H-single phase and codoping Al and Fe elements could reduce the system energy more effectively than the formation of Fe 3 Si [27,28,32]. Thus, single-phase (Al, Fe)-codoped 4H-SiC offers a chance to investigate the intrinsic magnetic features of Fe-doped SiC and also suggests that (1) the ability to resist the polytypes in SiC is enhanced significantly via doping Al since doping 1.7 at% Fe still does not break the single-phase structure;…”

“…For instance, Song et al observed the coexistence of 6H-SiC and 15R-SiC phases in Mn-doped 6H-SiC [26]; (4) TM elements often react with Si or C atoms to form the magnetic secondary phases: binary (ternary) carbides or silicides. Kuryliszyn-Kudelska et al [27] reported the formation of Fe 3 Si in Fe-doped SiC crystals while Song et al [28] found similar results in Fe-doped 6H-SiC powder samples. The presence of Fe 3 Si, a FM material with a T c of 837 K, makes it impossible to probe the natural magnetic properties of Fe-doped SiC embeded in the mixture.…”