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8 Oct 2007

Volume 91, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 91, 153101 (2007); http://dx.doi.org/10.1063/1.2793688 (3 pages)

B. J. Lee, K. Park, and Z. M. Zhang
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Ferromagnetic CrxTi1−xN solid solution nitride thin films grown by pulsed laser deposition and their magnetoresistance

Kei Inumaru, Kunihiko Koyama, Yuji Miyaki, Kazuma Tanaka, and Shoji Yamanaka

Appl. Phys. Lett. 91, 152501 (2007); http://dx.doi.org/10.1063/1.2776853 (3 pages) | Cited 6 times

Online Publication Date: 8 October 2007

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Epitaxial nitride films of CrxTi1−xN were grown on MgO (001) by pulsed laser deposition under nitrogen radical irradiation, and their magnetic and transport properties were investigated, which was motivated by calculations on magnetism pointing out similarities of CrN to LaMnO3, the parent compound of colossal magnetoresistance oxides. The films showed ferromagnetism for 0.28 ⩽ x ⩽ 0.5 and the TC showed a maximum (140 K) at x = 0.5. When x exceeded 0.5(x = 0.58) ferromagnetism disappeared completely. At x = 0.5, the nitride film showed a large magnetoresistance (6%–7% at 5 T), which had a maximum at 130 K.
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75.70.Ak Magnetic properties of monolayers and thin films
75.50.Dd Nonmetallic ferromagnetic materials
81.15.Fg Pulsed laser ablation deposition

Magnetic properties and microstructure of FePt/BN nanocomposite films with perpendicular magnetic anisotropy

Bao-He Li, Chun Feng, Xin Gao, Jiao Teng, Guang-Hua Yu, Xianran Xing, and Zhong-Yuan Liu

Appl. Phys. Lett. 91, 152502 (2007); http://dx.doi.org/10.1063/1.2798584 (3 pages) | Cited 7 times

Online Publication Date: 8 October 2007

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We have prepared L10-FePt/BN nanocomposite films by depositing the FePt/BN mutilayers on the MgO(100) substrates using magnetron sputtering followed by a postannealing process. We found the excellent perpendicular magnetic anisotropy of [FePt (2 nm)/BN (0.5 nm)]10 film after annealing at 700 °C for 1 h x-ray diffraction patterns also indicate an excellent (001) texture of the film. This film shows a perpendicular coercivity of 7.48 kOe and the ratio of the remnant magnetization Mr to the saturation one MS of as high as 0.93. We also found the good epitaxial growth of FePt grains on the MgO(100) substrate by cross-section high resolution transmitting microscopy.
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75.30.Gw Magnetic anisotropy
75.70.Ak Magnetic properties of monolayers and thin films
75.75.-c Magnetic properties of nanostructures
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Ss Magnetic recording materials

Estimation of Mn4+ ion content ratio in self-doped compound La1−xMnO3−δ

G. D. Tang, D. L. Hou, W. Chen, P. Hao, G. H. Liu, S. P. Liu, X. L. Zhang, and L. Q. Xu

Appl. Phys. Lett. 91, 152503 (2007); http://dx.doi.org/10.1063/1.2794777 (3 pages) | Cited 7 times

Online Publication Date: 9 October 2007

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A method based on the thermal equilibrium theory of crystal defects for estimating the Mn4+ ion content ratio (RM4) at B sites in ABO3 self-doped manganite La1−xMnO3−δ is presented. For this kind of manganite, the relationship between the Curie temperature (TC) and RM4 can be explained by the double exchange mechanism of Zener, which is similar to that in the perovskite manganite La1−xCaxMnO3.
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61.72.S- Impurities in crystals
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Spin-polarized current versus stray field in a perpendicularly magnetized superconducting spin switch

A. Singh, C. Sürgers, R. Hoffmann, H. v. Löhneysen, T. V. Ashworth, N. Pilet, and H. J. Hug

Appl. Phys. Lett. 91, 152504 (2007); http://dx.doi.org/10.1063/1.2794424 (3 pages) | Cited 12 times

Online Publication Date: 10 October 2007

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In superconducting Co/Pt–Nb–Co/Pt multilayers with perpendicular magnetic anisotropy, the superconducting transition temperature Tc is considerably higher in the parallel (P) orientation of the two Co/Pt magnetizations compared to the antiparallel (AP) orientation. Low temperature magnetic-force microscopy reveals that the individual ferromagnetic layers are uniformly magnetized in both configurations and do not exhibit a magnetic stray field arising from a multidomain state. We also demonstrate that the difference ΔTc = TcP−TcAP between both Tc values is enhanced at higher transport currents due to the increasing imbalance of spin-polarized charge carriers in the superconducting Nb layer. Hence, the spin switch can be controlled by the transport current in future superconducting devices.
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74.78.Fk Multilayers, superlattices, heterostructures
74.25.F- Transport properties
74.25.Ha Magnetic properties including vortex structures and related phenomena
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)
74.62.Yb Other effects
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

Magnetic field dependent behavior in perpendicular antiferromagnetically coupled multilayer films

Y. Fu, W. Pei, J. Yuan, T. Wang, T. Hasegawa, T. Washiya, H. Saito, and S. Ishio

Appl. Phys. Lett. 91, 152505 (2007); http://dx.doi.org/10.1063/1.2798496 (3 pages) | Cited 10 times

Online Publication Date: 10 October 2007

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Magnetization reversal and magnetic domain structures controlled by the magnetostatically induced stray field in perpendicular antiferromagnetically coupled [Pd/Co]7/Ru/Co/[Pd/Co]7 multilayer were investigated by magnetic force microscopy. For the sample demagnetized in plane, field-induced ferromagnetic domains at the boundary of antiferromagnetic domains provide the nucleation channel. The ferromagnetic domains in the channel are parallel aligned along the applied field out of plane firstly, and then the magnetization reversal is dominated by the propagation of the ferromagnetic channels toward the region of antiferromagnetic domains. The sample demagnetized in perpendicular direction shows antiferromagnetic coupling state. Ultraslow reversal dynamics were observed under a perpendicular critical magnetic field (Hcri) in a long time. The reversal process can be explained by the inhomogeneous local stray field and the competition between magnetostatic energy and exchange energy.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Jk Magnetization reversal mechanisms
75.60.Ch Domain walls and domain structure
75.50.Ee Antiferromagnetics

Giant magnetocaloric effect in antiferromagnetic ErRu2Si2 compound

Tapas Samanta, I. Das, and S. Banerjee

Appl. Phys. Lett. 91, 152506 (2007); http://dx.doi.org/10.1063/1.2798594 (3 pages) | Cited 44 times

Online Publication Date: 11 October 2007

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Giant magnetocaloric effect has been observed in ErRu2Si2, which is associated with field-induced metamagnetic transition from antiferromagnetic to ferromagnetic state. The maximum values of magnetic entropy change (−ΔSMmax) and adiabatic temperature change (ΔTadmax) for a field change of 7 T are evaluated to be 19.3 J/kg K and 15.9 K, respectively, around 5.5 K within the temperature range of 4–25 K. The value of ΔTadmax is even larger than other potential magnetic refrigerant materials reported in the same temperature range and also comparable to room temperature giant magnetocaloric materials exhibiting first-order magnetic transition from paramagnetic to ferromagnetic state.
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75.50.Ee Antiferromagnetics
75.50.Cc Other ferromagnetic metals and alloys
75.30.Sg Magnetocaloric effect, magnetic cooling
75.20.En Metals and alloys
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Low-field positive magnetoresistance near room temperature in three-component perovskite-type artificial superlattices

Kun Zhao, Meng He, and Hui-bin Lu

Appl. Phys. Lett. 91, 152507 (2007); http://dx.doi.org/10.1063/1.2799162 (3 pages) | Cited 6 times

Online Publication Date: 11 October 2007

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Perovskite-type superlattices consisting of La0.9Sr0.1MnO3, LaAlO3, and SrTiO3 were fabricated on (001) SrNb0.01Ti0.99O3 substrates by laser molecular beam epitaxy. The three-component superlattice exhibited desirable low-field magnetoresistance effects. At a given current bias of 10 μA, positive magnetoresistance ratio was enhanced from 2% to 15% and 22% with increasing temperatures from 15 to 300 and 325 K at 300 Oe, at which a maximum value occurred from the external magnetic field dependence of magnetoresistance. The nature of the enhanced magnetoresistance is discussed in connection to the interfacial effect.
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72.20.My Galvanomagnetic and other magnetotransport effects
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)

Current-in-plane magnetoresistance of spin valve elliptical rings

W. Jung, F. J. Castaño, and C. A. Ross

Appl. Phys. Lett. 91, 152508 (2007); http://dx.doi.org/10.1063/1.2798495 (3 pages) | Cited 7 times

Online Publication Date: 12 October 2007

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The giant magnetoresistance of NiFe/Cu/Co/IrMn spin valve elliptical rings with 3.2/1.9 μm major/minor diameter and widths of 340–370 nm has been characterized in a current-in-plane geometry. Spin valve rings show asymmetric magnetoresistance curves with three different resistance levels. Minor loop magnetoresistance measurements, which correspond to the switching of only the NiFe free layer, demonstrate that individual control of the chirality of the magnetization vortex in each ferromagnetic layer is possible, enabling at least 16 distinct magnetic configurations to be formed in a spin valve ring.
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75.47.De Giant magnetoresistance
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
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