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30 Jul 2012

Volume 101, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 101, 051103 (2012); http://dx.doi.org/10.1063/1.4738774 (4 pages)

Alec Rose, Da Huang, and David R. Smith
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Observation of magnetocapacitance in ferromagnetic nanowires

Kulothungasagaran Narayanapillai, Mahdi Jamali, and Hyunsoo Yang

Appl. Phys. Lett. 101, 052401 (2012); http://dx.doi.org/10.1063/1.4739848 (3 pages) | Cited 1 time

Online Publication Date: 30 July 2012

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The authors have investigated magnetic domain wall induced capacitance variation as a tool for the detection of magnetic reversal in magnetic nanowires for in-plane (NiFe) and out-of-plane (Co/Pd) magnetization configurations. The switching fields in the capacitance measurements match with that of the magnetoresistance measurements in the opposite sense. The origin of the magnetocapacitance has been attributed to magnetoresistance. This magnetocapacitance detection technique can be useful for magnetic domain wall studies.
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75.75.Fk Domain structures in nanoparticles
72.15.Gd Galvanomagnetic and other magnetotransport effects
75.50.Bb Fe and its alloys
75.50.Cc Other ferromagnetic metals and alloys
75.60.Ch Domain walls and domain structure
75.60.Jk Magnetization reversal mechanisms

Transversal magneto-resistance in epitaxial Fe3O4 and Fe3O4/NiO exchange biased system

Han-Chun Wu, R. Ramos, R. G. S. Sofin, Zhi-Min Liao, M. Abid, and I. V. Shvets

Appl. Phys. Lett. 101, 052402 (2012); http://dx.doi.org/10.1063/1.4739951 (5 pages) | Cited 1 time

Online Publication Date: 30 July 2012

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We have investigated transversal magneto-resistance (MR) in epitaxial Fe3O4 and Fe3O4/NiO exchange biased systems. It was found that the magnetic field dependence and the magnitude of the transversal MR in both systems strongly depend on the bias current density which suggests that the transversal MR in metal oxide with anti-phase boundaries (APBs) cannot be described by the conventional transversal MR for a single magnetic domain. The effect of electron scattering at the APBs may have to be considered. Angular dependence of the transversal MR at low temperature further indicates that the current explanation of the origin of transversal MR on the basis of anisotropic MR alone may not be sufficient for a system experiencing charge ordering.
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75.70.Ak Magnetic properties of monolayers and thin films
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
72.20.My Galvanomagnetic and other magnetotransport effects
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
75.47.Lx Magnetic oxides

Direct imaging of spin relaxation in stepped α-Fe2O3/Ni81Fe19 bilayers using x-ray photoemission electron microscopy

R. Bali, H. Marchetto, A. Barcza, M. G. Blamire, and S. S. Dhesi

Appl. Phys. Lett. 101, 052403 (2012); http://dx.doi.org/10.1063/1.4738781 (4 pages)

Online Publication Date: 31 July 2012

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The magnetic domain structure of stepped ferromagnetic Ni81Fe19 films, exchange coupled to antiferromagnetic α-Fe2O3, has been studied using x-ray photoemission electron microscopy combined with x-ray magnetic circular dichroism. Annealing the α-Fe2O3/Ni81Fe19 bilayers in a magnetic field, applied parallel or perpendicular to the step edges, results in a significant increase in the domain size compared to the as-grown bilayer. Subsequent zero-field annealing induces spin-relaxation along the crystallographic axes of the α-Fe2O3. The spin-relaxation process is found to depend on the magnetic field direction during annealing with the domain structure determined by a competition between the step-induced uniaxial anisotropy and the exchange anisotropy.
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75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
75.50.Ee Antiferromagnetics
75.60.Ch Domain walls and domain structure
78.20.Ls Magneto-optical effects
75.30.Et Exchange and superexchange interactions
75.30.Gw Magnetic anisotropy

Generating wave vector specific Damon-Eshbach spin waves in Py using a diffraction grating

J. Sklenar, V. S. Bhat, C. C. Tsai, L. E. DeLong, and J. B. Ketterson

Appl. Phys. Lett. 101, 052404 (2012); http://dx.doi.org/10.1063/1.4737438 (3 pages)

Online Publication Date: 31 July 2012

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A patterned square silver antidot lattice on a thin uniform permalloy film facilitates direct coupling of a quasi-uniform microwave field to short wavelength magnetic modes. The resulting modes are studied as a function of both the magnitude and orientation (relative to the symmetry axes of the array) of an in-plane, external DC magnetic field. The observed modes are identified as surface spin waves with wavelengths matching the Fourier components of the silver array.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.30.Ds Spin waves

Antiferromagnetic interaction in coupled CdSe/ZnMnSe quantum dot structures

D. Dagnelund, Q. J. Ren, I. A. Buyanova, A. Murayama, and W. M. Chen

Appl. Phys. Lett. 101, 052405 (2012); http://dx.doi.org/10.1063/1.4739852 (5 pages)

Online Publication Date: 1 August 2012

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Spin polarization of nonmagnetic CdSe quantum dots (QDs) coupled to adjacent ZnMnSe diluted magnetic semiconductor (DMS) is investigated by CW and time-resolved magneto-optical spectroscopy under tunable laser excitation. Efficient enhancement in the degree of σ− circular polarization of photoluminescence from the CdSe QDs is observed under optical excitation at the σ+-active exciton state of the DMS. The fact that the enhancement persists much longer than the exciton lifetime of the DMS rules out a role of the DMS excitons. A possible explanation is discussed in terms of antiferromagnetic coupling between the excitons in QDs and aligned Mn ions in DMS.
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75.70.Ak Magnetic properties of monolayers and thin films
78.55.Et II-VI semiconductors
78.66.Fd III-V semiconductors
78.47.da Excited states
75.50.Ee Antiferromagnetics
75.50.Pp Magnetic semiconductors

The Curie temperature distribution of FePt granular magnetic recording media

O. Hovorka, S. Devos, Q. Coopman, W. J. Fan, C. J. Aas, R. F. L. Evans, Xi Chen, G. Ju, and R. W. Chantrell

Appl. Phys. Lett. 101, 052406 (2012); http://dx.doi.org/10.1063/1.4740075 (4 pages) | Cited 3 times

Online Publication Date: 1 August 2012

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We present atomistic calculations of the magnetic phase transition behavior in an L10 FePt system to study the effect of grain size distribution on the Curie temperature (Tc) dispersion with relevance to heat assisted magnetic recording. Identifying the relation between the size and Tc of a grain by means of finite size scaling analysis of the differentiated magnetization versus T data allows to show that a lognormal size distribution transforms into a lognormal Tc distribution with moments dependent on the critical exponents. We also address the question of the universality class of FePt.
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81.05.Bx Metals, semimetals, and alloys
81.05.Rm Porous materials; granular materials
85.70.Li Other magnetic recording and storage devices (including tapes, disks, and drums)
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.50.Ss Magnetic recording materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Magnetocrystalline anisotropy behavior in the multiferroic BiMnO3 examined by Lorentz transmission electron microscopy

T. Asaka, M. Nagao, T. Yokosawa, K. Kokui, E. Takayama-Muromachi, K. Kimoto, K. Fukuda, and Y. Matsui

Appl. Phys. Lett. 101, 052407 (2012); http://dx.doi.org/10.1063/1.4742747 (4 pages)

Online Publication Date: 3 August 2012

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We investigated magnetic domain structures of a multiferroic manganite, BiMnO3, by Lorentz transmission electron microscopy. Ferromagnetic domains were observed below ∼105 K, close to the ferromagnetic Curie temperature, TC. The spontaneous magnetization aligns distinctly along the [010] direction, suggesting that the magnetic easy direction is along the b axis. Inflection and merging of the domain walls was observed at twin boundaries. This indicates pinning of the magnetic domain walls at crystallographic twin boundaries. Furthermore, we observed narrow magnetic domain walls, suggesting strong magnetocrystalline anisotropy.
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75.30.Gw Magnetic anisotropy
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.50.Dd Nonmetallic ferromagnetic materials
75.60.Ch Domain walls and domain structure
75.85.+t Magnetoelectric effects, multiferroics
75.30.Cr Saturation moments and magnetic susceptibilities
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