Abstract:The spin and orbital magnetic moments of the Fe 3 O 4 epitaxial ultrathin film synthesized by plasma assisted simultaneous oxidization on MgO(100) have been studied with X-ray magnetic circular dichroism (XMCD). The ultrathin film retains a rather large total magnetic moment, i.e. (2.73±0.15)μ B /f.u., which is ~ 70% of that for the bulk-like Fe 3 O 4 . A significant unquenched orbital moment up to (0.54±0.05) μ B /f.u. was observed, which could come from the symmetry breaking at the Fe 3 O 4 /MgO interface. Such sizable orbital moment will add capacities to the Fe 3 O 4 -based spintronics devices in the magnetization reversal by the electric field.
Electronic structures of strained Nd 1−x Ca x MnO 3 ͑NCMO͒ thin films with x = 0 to 0.8 are investigated via x-ray absorption spectroscopy ͑XAS͒. The obtained O 1s spectra within the photon energy 529-535 eV can be decomposed into e g ↑ 1 , e g ↑ 2 , t 2g ↓, and e g ↓ bands. Based on the assigned energy levels of these band states, the energies of magnetic exchange, crystal field and Jahn-Teller ͑JT͒ splitting are determined. Particularly, the JT splitting is around 0.8 eV, which is observed with O 1s XAS for the first time in NCMO thin films.
Ferromagnetic/paramagnetic bilayer systems have been used to investigate inverse spin-Hall effect (ISHE) extensively with the technique of spin-pumping which is based on a mechanism driving the spin moment from ferromagnetic layers into paramagnetic layers via the ferromagnetic resonance procession. When the spin current is induced in the paramagnetic layer, a transversal electrical potential difference is generated and can be measured. Among many, platinum is the most effective paramagnetic metal with a strong inverse spin-Hall effect due to its strong spin-orbit coupling. In this work, we study ISHE in two kinds of bilayer films, and . Our experimental results show that the voltage induced by ISHE in LSMO/Pt is one order smaller than that Py/Pt at 100 mW of microwave power, despite the fact that LSMO has much higher spin polarization than Py. Based on our fitting results, the reason for the reduction of spin-pumping effect in LSMO/Pt may be the strong anomalous Hall Effect in LSMO.
Articles you may be interested inEffect of superconducting spacer layer thickness on magneto-transport and magnetic properties of La0.7Sr0.3MnO3/YBa2Cu3O7/La0.7Sr0.3MnO3 heterostructures Transport and magnetization properties of superconducting/ferromagnetic bilayers YBa 2 Cu 3 O 7 / La 0.7 Sr 0.3 MnO 3 ͑YBCO/LSMO͒ are investigated with the thickness of bottom LSMO layer fixed at 50 nm and that of top YBCO ͑t͒ layer varied from 20 to 100 nm. Compared to bulk YBCO, the off set of superconducting temperature T SC-off is suppressed by 10 K for t = 20 nm. The suppression rate of T SC versus magnetic field H is obtained as 1.2Ϯ 0.2 K / T for all bilayers. Considering the polarization effect of LSMO on superconductivity is similar to the field effect, the internal field created by the LSMO in the YBCO͑20nm͒/LSMO͑50nm͒ bilayer is estimated as 40 T.
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