Crystallization of amorphous metals

Klein, H.-P.; Ghafari, M.; Ackermann, Marc; Gonser, U.; Wagner, H.-G.

doi:10.1016/0167-5087(82)90188-0

Cited by 25 publications

(1 citation statement)

References 5 publications

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“…The broad Bhf 5.5, 2.3, and 2.6 T corresponding to the Bhf 29.5, 30.0, and 33.2 T, respectively, confirm the amorphous nature of FeCoB [46]. The cause of different Bhfs contributions in the top and bottom parts of the FeCoB layer is due to the different magnetism caused by compositional differences [54,55].…”

Section: B Ginrs Measurements Under Xsw Condition;mentioning

confidence: 63%

Interface-resolved study of magnetism in MgO/FeCoB/MgO trilayers using x-ray standing wave techniques

et al. 2023

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Interfaces in MgO/FeCoB/MgO trilayer have been studied with grazing incident nuclear resonance scattering using the x-ray standing wave technique. High depth selectivity of the present method allows one to measure magnetism and structure at the two interfaces of FeCoB, namely, FeCoB on MgO and MgO on FeCoB, independently, yielding an intriguing result that both interfaces are not symmetric. A high-density layer with an increased magnetic hyperfine field at the FeCoB-on-MgO interface suggests different growth mechanisms at the two interfaces. The azimuthal angle-dependent magneto-optic Kerr effect measurements reveal the presence of unusual uniaxial magnetic anisotropy (UMA) in the trilayer. An in situ temperature-dependent study discovered that this UMA systematically reduces with temperature. After annealing at 250 • C, the trilayer starts following the standard Stoner-Wohlfarth model for in-plane UMA. The trilayer becomes isotropic at 450 • C with an order-of-magnitude increase in coercivity. The asymmetry at the interfaces is in turn explained by boron diffusion from the FeCoB interface layer into the nearby MgO layer. Stress-induced UMA is observed in the boron-deficient FeCoB layer, superimposed with the bulk FeCoB layer, and found to be responsible for unusual UMA. The temperature-dependent variation in the UMA and coercivity can be understood in terms of variations in the internal stresses and coupling between FeCoB bulk and the interface layer.

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Section: B Ginrs Measurements Under Xsw Condition;mentioning

confidence: 63%

Interface-resolved study of magnetism in MgO/FeCoB/MgO trilayers using x-ray standing wave techniques

et al. 2023

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The role of interfaces on the magnetic behavior of granular CuFeCo alloys

Ghafari¹,

Volland

Hahn

2005

Physica Status Solidi (a)

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PACS 75.47.De, 75.50.Tt, 75.70.Cn, 76.80.+y Granular thin films of face centered tetragonal (fct) FeCo-clusters in a γ-CuCo matrix show a giant magneto resistance effect. Cu 100-x (Fe 50 Co 50 ) x samples with 63 ≤ x ≤ 88 were examined using Mössbauer Spectroscopy, electron microscopy, Magnetoresistance, SQUID and Rutherford Backscattering Spectroscopy. In ultrafine particles with fct-FeCo imbedded in a CuCo matrix the giant magneto resistance effect is strongly correlated to the ratio of interface/bulk. The magnetic interfaces form an additional scattering centere for the electrons which causes an increase of the GMR effect.

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Thermally Activated Time Fluctuations of Nuclear Spin Orientation in Amorphous Fe81B19 Alloy

Lomonosov

Sedykh

Zemčík

1986

phys. stat. sol. (a)

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Change of the spin orientation in Fe81B19 amorphous alloys in a wide temperature interval (from 420 to 620 K) is investigated by Mössbauer spectroscopy. The fluctuation behaviour of the averaged spin orientation versus annealing time at isothermal heat treatment is obtained at certain tem‐peratures. It is shown that such behaviour is essentially affected by the contact surface the removing of which leads to the disappearance of the fluctuations. A phenomenological model of the fluctuation of the spin orientation in magnetostrictive (λs > 0) amorphous Fe‐based alloys is proposed which is in good qualitative agreement with the experimental results obtained in the present paper.

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Crystallization of amorphous metals

Cited by 25 publications

References 5 publications

Interface-resolved study of magnetism in MgO/FeCoB/MgO trilayers using x-ray standing wave techniques

Interface-resolved study of magnetism in MgO/FeCoB/MgO trilayers using x-ray standing wave techniques

The role of interfaces on the magnetic behavior of granular CuFeCo alloys

Thermally Activated Time Fluctuations of Nuclear Spin Orientation in Amorphous Fe81B19 Alloy

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