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3 Oct 2011

Volume 99, Issue 14, Articles (14xxxx)

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Appl. Phys. Lett. 99, 141901 (2011); http://dx.doi.org/10.1063/1.3644948 (3 pages)

G. Kozlowski, P. Zaumseil, M. A. Schubert, Y. Yamamoto, J. Bauer, J. Matejova, T. Schulli, B. Tillack, and T. Schroeder
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Positive exchange bias from magnetization reversal in La1−xPrxCrO3 (x ∼ 0.7–0.85)

Kenji Yoshii

Appl. Phys. Lett. 99, 142501 (2011); http://dx.doi.org/10.1063/1.3644473 (3 pages) | Cited 8 times

Online Publication Date: 4 October 2011

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The perovskite chromite La1−xPrxCrO3 shows an unusual positive exchange bias (PEB) and a negative exchange bias (NEB) associated with magnetization reversal, arising from an antiparallel Pr3+-Cr3+ coupling. Below ∼200 K, changing the cooling magnetic field switches the type of EB. A PEB appears in low cooling fields (<3–15 kOe), comparable with the internal magnetic field at the Pr site. The appearance of PEB or NEB depends on the orientation of the Pr3+ moment with respect to the canted Cr3+ component.
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75.60.Jk Magnetization reversal mechanisms
71.70.Gm Exchange interactions
75.30.Cr Saturation moments and magnetic susceptibilities
75.50.Ee Antiferromagnetics

Quantum anomalous Hall effect in doped ternary chalcogenide topological insulators TlBiTe2 and TlBiSe2

Chengwang Niu, Ying Dai, Lin Yu, Meng Guo, Yandong Ma, and Baibiao Huang

Appl. Phys. Lett. 99, 142502 (2011); http://dx.doi.org/10.1063/1.3645624 (3 pages) | Cited 4 times

Online Publication Date: 4 October 2011

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Ternary Chalcogenide TlBiTe2 and TlBiSe2 have been proved to be promising topological insulators. In the present work, the occurrence of quantum anomalous Hall effect for a model Hamiltonian with ferromagnetic order is predicted. The first-principle calculations reveal that Cr is the best candidate to induce the ferromagnetic order in the insulating phase among X (X = Ti, Cr, Fe, and Au). The magnetic order in insulating phase arises from the spin polarization of substitutional Cr atoms and the free carriers are not needed for the formation of the substantial ferromagnetic coupling. These are very significant for the dissipationless devices in spintronics.
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73.25.+i Surface conductivity and carrier phenomena
71.23.Cq Amorphous semiconductors, metallic glasses, glasses
72.25.Dc Spin polarized transport in semiconductors
75.10.Dg Crystal-field theory and spin Hamiltonians
73.43.-f Quantum Hall effects
75.25.Dk Orbital, charge, and other orders, including coupling of these orders

Anomalous Hall effect measurements on capped bit-patterned media

M. Ranjbar, S. N. Piramanayagam, S. K. Wong, R. Sbiaa, and T. C. Chong

Appl. Phys. Lett. 99, 142503 (2011); http://dx.doi.org/10.1063/1.3645634 (3 pages) | Cited 5 times

Online Publication Date: 4 October 2011

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The role of a small exchange coupling between isolated single-domain magnetic dots through a thin continuous film—in a system called capped bit-patterned media (CBPM)—has been studied experimentally using anomalous Hall effect measurements. The exchange coupling, provided by the thin continuous layer, was effective in reducing the switching field distribution (SFD) and coercivity under optimized conditions. SFD increases and coercivity decreases for very high values of exchange coupling due to the formation of multi-domains. Besides reducing SFD, the CBPM also exhibit potential writability advantage at higher densities, indicating their potential application as bit-patterned media.
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75.70.Ak Magnetic properties of monolayers and thin films
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Vv High coercivity materials
72.15.Gd Galvanomagnetic and other magnetotransport effects

Magnetism of cobalt nanoclusters on graphene on iridium

Chi Vo-Van, Stefan Schumacher, Johann Coraux, Violetta Sessi, Olivier Fruchart, Nick B. Brookes, Philippe Ohresser, and Thomas Michely

Appl. Phys. Lett. 99, 142504 (2011); http://dx.doi.org/10.1063/1.3646480 (3 pages) | Cited 1 time

Online Publication Date: 4 October 2011

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The structure and magnetic properties of Co clusters, comprising 26–2700 atoms, self-organized or not on the graphene/Ir(111) moiré, were studied in situ with the help of scanning tunneling microscopy and x-ray magnetic circular dichroism. Surprisingly, the small clusters have almost no magnetic anisotropy. We find indication for a magnetic coupling between the clusters.
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75.75.Cd Fabrication of magnetic nanostructures
81.16.Dn Self-assembly
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Cr Saturation moments and magnetic susceptibilities
61.46.Bc Structure of clusters (e.g., metcars; not fragments of crystals; free or loosely aggregated or loosely attached to a substrate)
75.50.Tt Fine-particle systems; nanocrystalline materials

Nonlinear motion of magnetic vortex under alternating-current magnetic field: Dynamic correction of a gyrovector and a damping tensor of the Thiele’s equation

Je-Ho Shim, Hong-Guang Piao, Sang Hyuk Lee, Suhk Kun Oh, Seong-Cho Yu, Seung Kee Han, and Dong-Hyun Kim

Appl. Phys. Lett. 99, 142505 (2011); http://dx.doi.org/10.1063/1.3645595 (3 pages) | Cited 2 times

Online Publication Date: 6 October 2011

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We investigated a forced oscillation motion of a magnetic vortex structure on a ferromagnetic nanodisk under an alternating-current (AC) external magnetic field using micromagnetic simulations. With variations of the AC field amplitude and the frequency, it has been revealed that the forced oscillation motion could become nonlinear and significantly deviated from the description of the original Thiele’s equation. We propose a simple model with a dynamic correction of a gyrovector and a damping tensor in solving the Thiele’s equation, which is valid even in case of the nonlinear magnetic vortex core motion.
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75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
75.50.Kj Amorphous and quasicrystalline magnetic materials
61.46.-w Structure of nanoscale materials

Magnetisation reversal in permalloy nanowires controlled by near-field charge interactions

A. Beguivin, L. A. O’Brien, A. V. Jausovec, D. Petit, and R. P. Cowburn

Appl. Phys. Lett. 99, 142506 (2011); http://dx.doi.org/10.1063/1.3646548 (3 pages)

Online Publication Date: 6 October 2011

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This study investigates the interaction between transverse head-to-head domain walls (THHDWs) in permalloy nanowires and magnetostatic charges located within a tripod structure in close proximity. This interaction enables remote pinning of the THHDW. Eight different interactions are measurable, depending on the initialising field sequence. The pinning strengths of an attractive potential well and a repulsive barrier are compared in this paper. Based on experimental measurements, micromagnetic simulations, and a monopolar analytical model, we demonstrate that pinning strength depends on the inhomogeneous charge distribution within the tripod and the relative orientation of the THHDW which faces the tripod.
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75.60.Jk Magnetization reversal mechanisms
75.75.-c Magnetic properties of nanostructures
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
75.78.Cd Micromagnetic simulations
75.50.Tt Fine-particle systems; nanocrystalline materials
75.60.Ch Domain walls and domain structure

Rashba diamond in an Aharonov-Casher ring

Xuhui Wang and Aurelien Manchon

Appl. Phys. Lett. 99, 142507 (2011); http://dx.doi.org/10.1063/1.3647569 (3 pages)

Online Publication Date: 7 October 2011

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Spin interference due to Rashba spin-orbit interaction (SOI) in a ballistic two-dimensional electron gas ring conductor submitted to a bias voltage is investigated theoretically. We calculate the scattering matrices and differential conductance with lead-ring junction coupling as an adjustable parameter. Due to the interference of electronic waves traversing the ring, the differential conductance modulated by both bias voltage and SOI exhibits a diamond-shaped pattern, thus termed as Rashba diamond. This feature offers a supplementary degree of freedom to manipulate phase interference.
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71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
73.23.Ad Ballistic transport
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