Neutron and X-Ray Small Angle Scattering Studies of Rapidly Quenched La-Fe Alloys

Eiji Kita*, Shinichiro Kondo, Hiromitsu Ino, Michihiro Furusaka, Kiiti Siratori, Hsin Yi Lee, Haydn Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Small angle scattering of neutrons and x-rays were measured in a range of 0.008 ≤ q [= (4π/λ) sinθ] ≤ 0.2 Å-1 for rapidly quenched La-Fe alloys. As-quenched alloys are superparamagnetic at room temperature and ferromagnetic below about 270 K. Both neutron and x-ray scattering show decreases of the intensity proportional to q-3 for the as-quenched specimen. Little effect was observed on decreasing the temperature to 10 K or with the application of an external magnetic field up to 5 kOe. These facts indicate that the scattering is not of magnetic origin. After an annealing at 350°C for 30 min., the alloys change into antiferromagnets. After heat treatment, the scattering intensity decreased considerably and its q-dependence changed to q-4. These results are discussed based on a two-stage solidification process of the alloy, estimated from magnetic measurements, and the "density variation between random boundaries" model caused by nonmagnetic Fe atoms dissolved at the periphery of La grains.

Original languageEnglish
Pages (from-to)451-454
Number of pages4
JournalJournal of the Physical Society of Japan
Volume66
Issue number2
DOIs
StatePublished - 1 Jan 1997

Keywords

  • Cluster
  • Fe
  • La
  • Neutron
  • Small angle scattering
  • Superparamagnetism
  • X-ray

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