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6 Sep 2004

Volume 85, Issue 10, pp. 1659-1861

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Appl. Phys. Lett. 85, 1793 (2004); http://dx.doi.org/10.1063/1.1790588 (3 pages)

Hyunsik Yoon, Kyoung Mi Lee, Dahl-Young Khang, Hong H. Lee, and Se-Jin Choi
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Enhanced Curie temperature of InMnP:Zn—TC∼300 K

Yoon Shon, H. C. Jeon, Y. S. Park, W. C. Lee, Seung Joo Lee, D. Y. Kim, H. S. Kim, H. J. Kim, T. W. Kang, Y. J. Park, Chong S. Yoon, and K. S. Chung

Appl. Phys. Lett. 85, 1736 (2004); http://dx.doi.org/10.1063/1.1790074 (3 pages) | Cited 5 times

Online Publication Date: 13 September 2004

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P-type bulk InP was prepared by the liquid encapsulated Czochralski method and subsequently diffused with Mn by heat treatment after the evaporation of Mn on top of InP:Zn using a molecular beam epitaxy system. The characteristics of Mn-diffused InMnP:Zn were investigated by an energy dispersive x-ray spectroscopy, photoluminescence, and a superconducting quantum interference device magnetometer measurements. The samples were characterized by transmission electron microscopy and no evidence of secondary phase formation of InMnP:Zn was found. The results of energy dispersive x-ray peak displayed injected concentration of Mn near 3%. The results of photoluminescence measurement showed that optical broad transitions related to Mn appeared around 1.2 eV and it was confirmed that the transitions around 1.2 eV were Mn-related band by the diffusion of Mn into InP:Zn. Clear ferromagnetic hysteresis loops were observed at 10 and 300 K and the temperature-dependent magnetization showed ferromagnetic behavior around 300 K, which is caused by carrier-mediated ferromagnetism in InMnP:Zn. It is found that a ferromagnetic semiconductor at room temperature can be formed in diluted magnetic semiconductor based on GaMnN and InMnP additionally co-doped with Mg and Zn, respectively.
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75.50.Pp Magnetic semiconductors
75.50.Dd Nonmetallic ferromagnetic materials
81.10.Fq Growth from melts; zone melting and refining
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
78.55.Cr III-V semiconductors
82.80.Ej X-ray, Mössbauer, and other γ-ray spectroscopic analysis methods
68.37.Lp Transmission electron microscopy (TEM)

Anisotropy of g-factor and electron spin resonance linewidth in modulation doped SiGe quantum wells

H. Malissa, W. Jantsch, M. Mühlberger, F. Schäffler, Z. Wilamowski, M. Draxler, and P. Bauer

Appl. Phys. Lett. 85, 1739 (2004); http://dx.doi.org/10.1063/1.1788881 (3 pages) | Cited 7 times

Online Publication Date: 13 September 2004

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We investigate the electron spin resonance of electrons in Si1−xGex quantum wells defined by SiGe barriers (19%–25%Ge). Adding small amounts of Ge changes both g-factor and linewidth and their anisotropy. We explain these effects in terms of the Bychkov–Rashba field that originates from one-sided modulation doping. The main effect arises from the increase in spin–orbit interaction with increasing x. We argue that these effects may be used to tune the g-factor of electrons in quantum dots for a selective spin manipulation.
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73.63.Hs Quantum wells
71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
76.30.Pk Conduction electrons
61.72.S- Impurities in crystals
71.18.+y Fermi surface: calculations and measurements; effective mass, g factor
81.70.Jb Chemical composition analysis, chemical depth and dopant profiling

Nonsymmetric current–voltage characteristics in ferromagnet∕superconductor thin film structures

N. Touitou, P. Bernstein, J. F. Hamet, Ch. Simon, L. Méchin, J. P. Contour, and E. Jacquet

Appl. Phys. Lett. 85, 1742 (2004); http://dx.doi.org/10.1063/1.1789231 (3 pages) | Cited 15 times

Online Publication Date: 13 September 2004

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We found that the current–voltage characteristics measured on La0.66Sr0.33MnO3∕YBa2Cu3O7−δ thin film heterostructures patterned as microbridges are nonsymmetric if the magnetization direction of the La0.66Sr0.33MnO3 film is in plane and perpendicular to the current direction. This effect is attributed to the contribution of the magnetic moment of this film to the vertical component of the field along the edges of the bridge. We suggest that this effect could find an application in the reading process of magnetic memories.
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74.72.-h Cuprate superconductors
75.50.Dd Nonmetallic ferromagnetic materials
74.78.Fk Multilayers, superlattices, heterostructures
74.78.-w Superconducting films and low-dimensional structures
74.25.F- Transport properties
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Cr Saturation moments and magnetic susceptibilities

Mössbauer effect probe of field-induced magnetic phase transition in LaFe13−xSix intermetallic compounds

Zhao-hua Cheng, Nai-li Di, Qing-an Li, Zhi-qi Kou, Zhi Luo, Xiao Ma, Guang-jun Wang, Feng-xia Hu, and Bao-gen Shen

Appl. Phys. Lett. 85, 1745 (2004); http://dx.doi.org/10.1063/1.1789235 (3 pages) | Cited 3 times

Online Publication Date: 13 September 2004

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Direct evidence of a field-induced magnetic phase transition in LaFe13−xSix intermetallics with a large magneticaloric effect was provided by 57Fe Mössbauer spectra in externally applied magnetic fields. Moreover, Mössbauer spectra demonstrate that a magnetic structure collinear to the applied field is abruptly achieved in LaFe11.7Si1.3 compound once the ferromagnetic state appears, showing a metamagnetic first-order phase transition. In the case of LaFe11.0Si2.0, the Fe magnetic moments rotate continuously from a random state to the collinear state with increasing applied field, showing that a second-order phase transition is predominant. The different types of phase transformation determine the magnetocaloric effects in response to temperature and field in these two samples.
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75.50.Bb Fe and its alloys
76.80.+y Mössbauer effect; other γ-ray spectroscopy
75.30.Sg Magnetocaloric effect, magnetic cooling
75.30.Cr Saturation moments and magnetic susceptibilities
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Magnetic properties of magnetically isolated L10-FePt nanoparticles

Satoru Momose, Hiroyoshi Kodama, Takuya Uzumaki, and Atsushi Tanaka

Appl. Phys. Lett. 85, 1748 (2004); http://dx.doi.org/10.1063/1.1789238 (3 pages) | Cited 13 times

Online Publication Date: 13 September 2004

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This letter reports the results obtained by measuring the temperature dependence of the coercivity of magnetically isolated L10-FePt nanoparticles in agglomeration-free films deposited by using a dispersion stabilizer and a spin-coat technique. These measurements not only give the basic magnetic parameters of the nanoparticles but also provide information about the nanoparticle ordering process. The temperature at which isolated FePt nanoparticles start to order seems to be about 650°C.
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75.50.Bb Fe and its alloys
75.50.Tt Fine-particle systems; nanocrystalline materials
75.70.Ak Magnetic properties of monolayers and thin films
81.40.Gh Other heat and thermomechanical treatments
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.15.-z Methods of deposition of films and coatings; film growth and epitaxy
61.46.-w Structure of nanoscale materials
81.07.Bc Nanocrystalline materials

Large magnetostriction in Fe100−xAlx (15⩽x⩽30) melt-spun ribbons

Z. H. Liu, G. D. Liu, M. Zhang, G. H. Wu, F. B. Meng, H. Y. Liu, L. Q. Yan, J. P. Qu, and Y. X. Li

Appl. Phys. Lett. 85, 1751 (2004); http://dx.doi.org/10.1063/1.1789242 (3 pages) | Cited 7 times

Online Publication Date: 13 September 2004

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Magnetostriction of Fe100−xAlx (15⩽x⩽30) al1oys has been largely improved by using melt-spun method. The large magnetostriction up to −700 ppm obtained in Fe81Al19 sample is about 5 times as large as that in conventional bulk samples of Fe–Al composition. It has been ascribed to the high concentration of Al–Al atom pairs created by melting-spinning method and their strongly preferential orientation in [100] textured ribbon plane. The remarkable anisotropic magnetostriction reflects the magnetoelastic competition occurring in those strong textured and thin ribbon samples. The composition dependence of the magnetostriction in ribbon samples has been found to be consistent with bulk materials.
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75.50.Bb Fe and its alloys
75.80.+q Magnetomechanical effects, magnetostriction
75.70.Ak Magnetic properties of monolayers and thin films
75.30.Gw Magnetic anisotropy
68.55.-a Thin film structure and morphology
68.55.A- Nucleation and growth
68.60.Bs Mechanical and acoustical properties
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