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15 Aug 2011

Volume 99, Issue 7, Articles (07xxxx)

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Appl. Phys. Lett. 99, 073701 (2011); http://dx.doi.org/10.1063/1.3599706 (3 pages)

Miguel A. Santiago-Cordoba, Svetlana V. Boriskina, Frank Vollmer, and Melik C. Demirel
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Strain control spin reorientation transition in DyFeO3/SrTiO3 epitaxial film

T.-Y. Khim, M. J. Eom, J. S. Kim, B.-G. Park, J.-Y. Kim, and J.-H. Park

Appl. Phys. Lett. 99, 072501 (2011); http://dx.doi.org/10.1063/1.3623756 (3 pages) | Cited 1 time

Online Publication Date: 15 August 2011

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We grew single phase DyFeO3 (110) epitaxial films on SrTiO3(001) substrates in the layer-by-layer mode using the pulsed laser deposition. The Fe L2,3-edge x-ray magnetic linear dichroism and magnetic hysteresis confirm that the film shows the spin-canted antiferromagnetism at room temperature and undergoes the spin reorientation transition (SRT) upon cooling as the bulk. The SRT temperature is significantly reduced in the thin films due to the compressive strain and becomes below 5 K for the thickness ≲ 50 Å.
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75.30.Ds Spin waves
75.30.Wx Spin crossover
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
75.50.Ee Antiferromagnetics
75.70.Ak Magnetic properties of monolayers and thin films
81.15.Fg Pulsed laser ablation deposition

Suppression of the spin pumping in Pd/Ni81Fe19 bilayers with nano-oxide layer

Duck-Ho Kim, Hong-Hyoun Kim, and Chun-Yeol You

Appl. Phys. Lett. 99, 072502 (2011); http://dx.doi.org/10.1063/1.3626593 (3 pages) | Cited 1 time

Online Publication Date: 17 August 2011

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We demonstrate that the spin pumping effect can be effectively suppressed with a nano-oxide layer. Spin pumping effect manifests itself by an enhancement of the Gilbert damping parameter in normal metal/ferromagnetic hetero-structures, while many spintronics devices prefer smaller damping parameter. Since the spin pumping effect is directly related with the spin dependent interface conductance, we can modify the spin pumping by altering the interface conductance with the nano-oxide layer. We prepared series of Pd/Ni81Fe19 bilayers with different pausing time between Pd and Ni81Fe19 depositions in order to control the interface conductance. The Gilbert damping parameters are determined from the line-width measurements in the ferromagnetic resonance spectra for each pausing time sample. They are 0.0490, 0.0296, 0.0278, and 0.0251 for 0, 6, 30, and 60 s pausing time, respectively. We find that the damping parameter of Pd/Ni81Fe19 is almost recovered to one of the Cu/Ni81Fe19 bilayer with 60 s pausing time, while the static magnetic properties are not noticeably changed.
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81.05.Bx Metals, semimetals, and alloys
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
75.76.+j Spin transport effects
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Bb Fe and its alloys
75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)

First principles study of the electric field effect on magnetization and magnetic anisotropy of FeCo/MgO(001) thin film

K. H. He, J. S. Chen, and Y. P. Feng

Appl. Phys. Lett. 99, 072503 (2011); http://dx.doi.org/10.1063/1.3626598 (3 pages) | Cited 6 times

Online Publication Date: 17 August 2011

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The magnetization and magnetic anisotropy of FeCo/MgO(001) thin film under electric field were investigated by the first-principles calculations. Three different interface configurations were considered: Co/Fe/MgO, Fe/Co/MgO, and FeCo/FeCo/MgO. It was found that the perpendicular anisotropy was preferred for all the configurations and enhanced with increasing electric field, which was consistent with experimental results. Furthermore, our calculations indicated that the FeCo/FeCo/MgO was the most stable configuration and had the largest perpendicular magnetic anisotropy energy. The results also showed that the FeCo/FeCo/MgO and Fe/Co/MgO configurations had larger magnetoelectric coefficients than those of the Co/Fe/MgO configuration and previous report about the Fe/MgO interface.
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75.70.-i Magnetic properties of thin films, surfaces, and interfaces
71.15.-m Methods of electronic structure calculations
75.30.Gw Magnetic anisotropy
75.85.+t Magnetoelectric effects, multiferroics
77.55.Nv Multiferroic/magnetoelectric films
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