Hee Chan Ku

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We present measurements of the spin and orbital magnetic moments of Fe3O4 by using SQUID and magnetic circular dichroism in soft x-ray absorption. The measurements show that Fe3O4 has a noninteger spin moment, in contrast to its predicted half-metallic feature. Fe3O4 also exhibits a large unquenched orbital moment. Calculations using the local density(More)
We studied the relationship between eye position in the awakened state and in the surgical plane of anesthesia in orthophoric and horizontal strabismus patients. We classified 105 orthophoric and horizontal strabismus patients into 5 groups, measured the eye position at the primary position by photographic measurement of the corneal reflex positions and(More)
  • H. D. Yang, I. P. Hong, +9 authors W.-H. Li
  • 2003
The specific heat ðCÞ of bi-layered manganites La2 2 2xSr1 þ 2xMn2O7 (x 1⁄4 0:3 and 0.5) is investigated for the ground state of low temperature excitations. A T dependent term in the low temperature specific heat (LTSH) is identified at zero magnetic field and suppressed by magnetic fields for x 1⁄4 0:3 sample, which is consistent with a ferromagnetic(More)
Ferrimagnetic Mn,N films were deposited on Si (100) substrate by dc reactive magnetron sputtering from sintered Mn target. Highly (002) textured Mn,N ordered phase is formed in situ at studied substrate temperatures of 150-250 “C without further annealing. Anomalous perpendicular magnetoanisotropy exists in these face-centered cubic films with larger(More)
The magnetic ordering of the Pr ions in Pb&PrCuaOs has been studied using neutron-diffraction and ac-suspectibility measurements. An imperfect three-dimensional magnetic ordering of the Pr spins was observed at a temperature well below its Neel temperature of TN=7 K. The magnetic intensities observed at T= 1.4 K can be explained by assuming long-range order(More)
Coexistence of exchange bias (H(E)) and magnetization (M) shift was observed in as-grown and field-annealed MnO(x)/Ga(0.95)Mn(0.05)As bilayers. It was found that H(E) initially decreases with the annealing time t(a) and then increases when t(a) > 30 min, while the M shift remains almost unchanged with t(a). X-ray photoelectron spectroscopy (XPS) analysis(More)
Magnetization measurements with the magnetic field parallel to the c-axis were performed on overdoped Bi2¡ xPbxSr2CaCu2O8+ ± single crystals. Different from undoped Bi2Sr2CaCu2O8+ ± single crystal, a pronounced anomalous peak with maximum peak field over 5000 G can be observed in enlarging temperature window from 0.2Tc to 0.9Tc; both the anomalous(More)
PURPOSE To investigate the frequency of residual cortex and the effectiveness of removal of residual cortex in the fovea during vitrectomy for primary rhegmatogenous retinal detachment repair. METHODS We retrospectively reviewed the charts and the operative videos of the 80 patients (80 eyes) who underwent vitrectomy for repair and who were observed for(More)
Two systems of ternary transition metal phosphides with the ordered Fe(2)P-type hexagonal structure are reported. They have the general formula MRuP and MOsP, in which M can be Ti, Zr, or Hf. An onset of the superconducting transition temperature as high as 13.0 K is reported for the ZrRuP compound.
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