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5 Jun 2000

Volume 76, Issue 23, pp. 3337-3483

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Saturation magnetization and uniaxial magnetocrystalline anisotropy for Co-based binary and Co–Ge–Cr ternary alloys

M. Takahashi, H. Shoji, S. Kadowaki, D. D. Djayaprawira, Y. Komori, and H. Domon

Appl. Phys. Lett. 76, 3457 (2000); http://dx.doi.org/10.1063/1.126676 (3 pages) | Cited 6 times

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In order to develop a magnetic material for high-density magnetic recording media which overcomes the thermal agitation effect, the magnetic properties, such as saturation magnetization and magnetic anisotropy, were evaluated for Co–M (M=Pt, Pd, Ru, Rh, Os, Cr, Ge, Mo, Mn, Re, and Si) binary alloys. Ge addition was found to be effective in maintaining the value of the magnetic anisotropy field of Co. Furthermore, a ternary magnetic alloy of Co–Ge–Cr (85 at. % Co, 10 at. % Ge, 5 at. % Cr) was found to have the following magnetic properties: Kugrain ≥ 3×106 erg/cm3, Hkgrain ≈ 10 kOe, and 4πMs/Hkgrain<1.0. This magnetic material is a very promising candidate for use in high-density magnetic recording media. © 2000 American Institute of Physics.
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75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Ss Magnetic recording materials
75.30.Gw Magnetic anisotropy

Magnetic entropy change in Ni51.5Mn22.7Ga25.8 alloy

Feng-xia Hu, Bao-gen Shen, and Ji-rong Sun

Appl. Phys. Lett. 76, 3460 (2000); http://dx.doi.org/10.1063/1.126677 (3 pages) | Cited 120 times

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A considerable magnetic entropy change has been observed in Ni51.5Mn22.7Ga25.8 alloys under a field of 0.9 T. This change originates from a sharp magnetization jump which is associated with a martensitic to austenitic structure transition. The large low field entropy change and the adjustable martensic–austensic transition temperature indicate a great potential of Ni–Mn–Ga as working materials for magnetic refrigerants in a wide temperature range. © 2000 American Institute of Physics.
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75.30.Sg Magnetocaloric effect, magnetic cooling
81.05.Bx Metals, semimetals, and alloys
81.30.Kf Martensitic transformations
75.40.-s Critical-point effects, specific heats, short-range order
65.20.-w Thermal properties of liquids
65.40.gd Entropy
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
64.70.K- Solid-solid transitions
81.30.Hd Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder

Decomposition of susceptibility spectra in a torsion-stressed Fe-based amorphous wire

Cheol Gi Kim, Seok Soo Yoon, and Seong-Cho Yu

Appl. Phys. Lett. 76, 3463 (2000); http://dx.doi.org/10.1063/1.126678 (3 pages) | Cited 4 times

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The complex susceptibility spectra are measured as functions of the alternating-current field amplitude and the torsion angle in an Fe77.5Si7.5B15 amorphous wire. The susceptibility spectra show dispersion with a relaxation frequency of 40 kHz due to irreversible motion of the inner core domain walls when the driving field is larger than the threshold field of 10 mOe. The spectra for a small driving field can be decomposed into two relaxation dispersions by using the nonlinear curve fitting, one originating from reversible wall motion of the inner core domains and with a relaxation frequency of 0.36 MHz, and the other originating from reversible magnetization rotation in the outer shell domains and with relaxation frequency of 1.82 MHz. The static susceptibilities resulting from the reversible and the irreversible magnetization processes show an asymmetric change with positive and negative torsion angles. © 2000 American Institute of Physics.
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75.50.Kj Amorphous and quasicrystalline magnetic materials
75.50.Bb Fe and its alloys
75.80.+q Magnetomechanical effects, magnetostriction
75.30.Cr Saturation moments and magnetic susceptibilities
75.60.Ch Domain walls and domain structure

High-Tc superconductor Bi2Sr2CaCu2O8+δ tunnel junction with Zn counterelectrode

Shao-Xiong Li, Hong-Jie Tao, Yi Xuan, Bo-Ru Zhao, and Zhong-Xian Zhao

Appl. Phys. Lett. 76, 3466 (2000); http://dx.doi.org/10.1063/1.126679 (3 pages) | Cited 1 time

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Using Zn thin film as counterelectrode, Bi2Sr2CaCu2O8+δ tunnel junctions were prepared. Temperature-dependent tunneling spectra of these planar junctions provided measurements of energy gap, 2Δ, and transition temperature, Tc. The spectra also allowed the observation of pseudogap in normal state and showed strong evidence of d-wave symmetry of the superconducting order parameter. The present junction may find its way in the electronics applications. © 2000 American Institute of Physics.
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74.45.+c Proximity effects; Andreev reflection; SN and SNS junctions
74.50.+r Tunneling phenomena; Josephson effects
74.72.-h Cuprate superconductors
74.25.Jb Electronic structure (photoemission, etc.)
74.62.Yb Other effects

Effect of interfacial strain on critical temperature of YBa2Cu3O7−δ thin films

H. Y. Zhai and W. K. Chu

Appl. Phys. Lett. 76, 3469 (2000); http://dx.doi.org/10.1063/1.126680 (3 pages) | Cited 19 times

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Ultrathin YBa2Cu3O7−δ (YBCO) films down to two unit cells thick have been prepared on LaAlO3 (LAO) and SrTiO3 (STO) substrates for the study of substrate-induced strain effects on critical transition temperature (Tc). The YBCO on LAO has a higher Tc than that on STO for very thin films, and this Tc difference increases with reduction of film thickness. X-ray diffraction experiments reveal that compressive strain exists in the a–b plane for YBCO thin films on LAO, while tensile strain occurs for films on STO. The different stresses in these films account for the Tc difference. © 2000 American Institute of Physics.
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74.78.-w Superconducting films and low-dimensional structures
74.72.-h Cuprate superconductors
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
68.60.Bs Mechanical and acoustical properties
81.15.Cd Deposition by sputtering
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