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18 Apr 2005

Volume 86, Issue 16, Articles (16xxxx)

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Soft magnetic ternary iron-boron-based bulk metallic glasses

Chih-Yuan Lin, Hung-Yu Tien, and Tsung-Shune Chin

Appl. Phys. Lett. 86, 162501 (2005); http://dx.doi.org/10.1063/1.1901808 (3 pages) | Cited 44 times

Online Publication Date: 11 April 2005

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Ternary iron-boron-based bulk metallic glasses (BMGs) were explored exhibiting capability of thick amorphous casting at least 1 mm in rod diameter or 0.5 mm in plate thickness, excellent soft magnetic properties with saturation magnetization 1.56 T and coercivity smaller than 40 A/m, and electrical resistivity larger than 200 μΩ cm. The BMG alloys represented by the formulas MaFebBc are based on two simple selection rules: (1) M is an element with an atomic radius at least 130% that of Fe; (2) M possesses eutectic points with both Fe and B, and the M-Fe eutectic is at the Fe-rich end. Among more than 30 candidate M elements, Sc, Y, Dy, Ho, and Er fulfill BMG capability at the composition range, in at %, 3<a<10, 18<c<27, whereas a+b+c = 100. It is very remarkable that with a tiny addition of M, such as 4 at %, the critical cooling rate to form an amorphous state is abruptly lowered by more than four orders of magnitude as compared with Fe-B binary alloys, and a bulk amorphous state is achievable with only three elements (conventional ones 4–7 elements). These alloys are promising as core materials for transformers.
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75.50.Bb Fe and its alloys
75.50.Kj Amorphous and quasicrystalline magnetic materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
72.15.Cz Electrical and thermal conduction in amorphous and liquid metals and alloys

Magnetic anisotropy and domain patterning of amorphous films by He-ion irradiation

Jeffrey McCord, Thomas Gemming, Ludwig Schultz, Jürgen Fassbender, Maciej Oskar Liedke, Michael Frommberger, and Eckhard Quandt

Appl. Phys. Lett. 86, 162502 (2005); http://dx.doi.org/10.1063/1.1906321 (3 pages) | Cited 24 times

Online Publication Date: 12 April 2005

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The magnetic anisotropy in amorphous soft magnetic FeCoSiB films was modified by He-ion irradiation. A rotation of uniaxial anisotropy depending on the applied field direction in the irradiated areas is observed by magnetometry and complementary domain observation by Kerr microscopy. No significant degradation in magnetic properties relative to the as-deposited state is found from the magnetization loops on nonpatterned films. Using irradiation together with photolithography, the films were treated locally, resulting in “anisotropy patterned” structures. Complicated periodic domain patterns form due to the locally varying anisotropy distribution. Overall magnetic properties and domain patterns are adjusted.
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75.50.Kj Amorphous and quasicrystalline magnetic materials
75.30.Gw Magnetic anisotropy
75.60.Ch Domain walls and domain structure
75.50.Bb Fe and its alloys
78.20.Ls Magneto-optical effects
61.80.Jh Ion radiation effects
75.70.Ak Magnetic properties of monolayers and thin films

Intergranular strain correlation with magnetic behavior in steel

Roxana Hutanu, Lynann Clapham, and R. B. Rogge

Appl. Phys. Lett. 86, 162503 (2005); http://dx.doi.org/10.1063/1.1904710 (3 pages) | Cited 3 times

Online Publication Date: 12 April 2005

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The correlation between the magnetic behavior and intergranular residual strain was investigated on several mild steel samples which were plastically deformed in the range 0.5%–20% engineering strain followed by unloading. At low deformation levels (0.5%– ∼ 2%) the samples exhibited Luders banding, but after 2% strain the samples appeared uniformly deformed. Magnetic Barkhausen noise (MBN) measurements were used to characterize magnetic behavior and neutron diffraction measurements were used to determine the inter-granular strain. MBN results indicated a high MBN value in the direction transverse to the applied stress. This corresponded to a high strain in the (100) crystallographic direction (the easy magnetization direction), as observed using neutron diffraction. Little correlation was obtained between the MBN result and the (112) strain, which is generally assumed to reflect the macroscopic residual stress. Angular MBN and neutron diffraction results further confirmed the strong correlation between the (100) strain and the MBN result.
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75.50.Bb Fe and its alloys
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.40.Lm Deformation, plasticity, and creep
62.20.F- Deformation and plasticity

Effects of cation disorder and size on metamagnetism in A-site substituted Pr0.5Ca0.5MnO3 system

K. R. Mavani and P. L. Paulose

Appl. Phys. Lett. 86, 162504 (2005); http://dx.doi.org/10.1063/1.1905786 (3 pages) | Cited 10 times

Online Publication Date: 14 April 2005

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The effects of A-site cation disorder and size on metamagnetism of ABO3 type charge and orbital ordered Pr0.5Ca0.5MnO3 system have been studied by substituting Ba+2 for Ca+2 or La+3 for Pr+3. Substitution of 5% Ba+2 or 5% La+3 drastically reduces the critical magnetic field (Hc) for metamagnetism and induces successive steplike metamagnetic transitions at low temperatures. Interestingly, with further increase in substitution, Hc rises. We find that there is a sharp decrease in electrical resistivity corresponding to the metamagnetic transitions, which is indicative of strongly correlated magnetic and electronic transitions in these manganites.
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75.47.Lx Magnetic oxides
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Magnetostriction in ⟨110⟩ and ⟨112⟩ oriented crystals Tb0.36Dy0.64(Fe0.85Co0.15)2

Tianyu Ma, Chengbao Jiang, and Huibin Xu

Appl. Phys. Lett. 86, 162505 (2005); http://dx.doi.org/10.1063/1.1896430 (3 pages) | Cited 16 times

Online Publication Date: 15 April 2005

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Magnetostriction of ⟨110⟩ and ⟨112⟩ oriented crystals Tb0.36Dy0.64(Fe0.85Co0.15)2 under various conditions of compressive prestress and applied fields was investigated at room temperature (30 °C), elevated temperature (100 °C) and cryogenic temperature (−80 °C). Obvious magnetostriction jump effect was observed in both ⟨110⟩ and ⟨112⟩ oriented crystals at room temperature and elevated temperature, but less obvious at cryogenic temperature. When the compressive prestress is not higher than 10 MPa, the ⟨112⟩ oriented crystal exhibits larger magnetostriction than that of ⟨110⟩ oriented crystal in low applied field at room temperature and cryogenic temperature, but smaller magnetostriction at elevated temperature.
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75.50.Bb Fe and its alloys
75.80.+q Magnetomechanical effects, magnetostriction

Magnetization profile in antiferromagnetically coupled recording media

Michael F. Toney, Julie A. Borchers, Kevin V. O’Donovan, Charles F. Majkrzak, David T. Margulies, and Eric E. Fullerton

Appl. Phys. Lett. 86, 162506 (2005); http://dx.doi.org/10.1063/1.1906300 (3 pages) | Cited 2 times

Online Publication Date: 15 April 2005

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We report polarized neutron reflectivity (PNR) studies of antiferromagnetically coupled (AFC) magnetic recording media with the aim of understanding how the two ferromagnetic layers switch magnetization direction. The PNR measurements were conducted at applied magnetic fields from near saturation to near the coercive field of the upper layer. From the PNR spectra, we obtain the magnetization profile of the AFC media. The results verify that the lower layer is aligned antiparallel to the magnetically hard upper layer in low fields. However, the magnetization of the upper layer shows an unexpected decrease as the lower layer reverses direction, which indicates that the interaction between the upper and lower layers is more complex than previously thought.
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75.50.Ss Magnetic recording materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Ee Antiferromagnetics
75.50.Cc Other ferromagnetic metals and alloys
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