Nonzero orbital moment in high coercivityϵ-Fe2O3and low-temperature collapse of the magnetocrystalline anisotropy

Crystallization and magnetic property of iron oxide nanoparticles precipitated in silica glass matrix

“…The coercive force of 0.14 T in ε-Fe 2 O 3 /SiO 2 composite film observed in this study is much suppressed in contrast to the reported value of 2 T [5][6][7] . Small coercivity in ε-Fe 2 O 3 /SiO 2 nanocomposite was also reported by several groups 8,9 .…”

“…γ-phase has a spinel structure and ferrimagnetic behavior with a Curie temperature (T C ) of 928 K 1,4 . Recently, an enormously large room temperature coercivity about 2 T was reported on ε-Fe 2 O 3 phase [5][6][7] , but the value is not reproducible 8,9 . It has an orthorhombic structure and is ferromagnetic with T C = 480 K 6,10 .…”

Study of the phase composition of Fe2O3 and Fe2O3/TiO2 nanoparticles using X‐ray diffraction and Debye formula

“…It is an intermediate product of the γ-Fe 2 O 3 (maghemite) to α-Fe 2 O 3 (hematite) solid-state transformation, and can be isolated only in a form of nanoscaled objects [1][2][3][4][5][6]. The phase attracted much attention due to its enormous roomtemperature coercivity of about 2 T [2][3][4], and a lowtemperature collapse of magneto-crystalline anisotropy due to strong suppression of the spin-orbital interaction [7]. The main goal of our research was to optimize a high-yield preparation procedure of the ε-Fe 2 O 3 by the investigation of the ex-situ prepared samples in order to determine influence of the particle size on the Fe 2 O 3 phase composition.…”

Observation of Orbital Order in the Half-Filled 4f Gd Compound

“…For example, the non-zero d orbital moment in Fe 3+ (d 5 configuration) systems, e.g., GaFeO 3 and ǫ-Fe 2 O 3 compounds, has been observed by soft x-ray magnetic circular dichroism measurements at the Fe L-edge [8,9]. In the Ca-doped BiFeO 3 compound, the anisotropically reconstructed Fe 3+ d orbital band was observed by resonant soft x-ray scattering [10].…”

“…Interestingly, in the last decade, many studies have demonstrated experimentally that the orbital angular momentum in half-filled systems does not follow Hund's rule [8][9][10][11][12][13]. For example, the non-zero d orbital moment in Fe 3+ (d 5 configuration) systems, e.g., GaFeO 3 and ǫ-Fe 2 O 3 compounds, has been observed by soft x-ray magnetic circular dichroism measurements at the Fe L-edge [8,9].…”