Journal of Materials Research

Rapid Communications

Rapid constructing magnetic phase diagrams by magneto-optical imaging of composition spread films

M.J. Turchinskayaa1, L.A Benderskya1 c1, A.J. Shapiroa1, K.S. Changa2, I. Takeuchia2 and A.L. Roytburda2

a1 Metallurgy Division, Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899

a2 Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742

Abstract

In this paper we present a new method of the rapid construction of magnetic phase diagrams in a temperature-composition space, using magneto-optic imaging with an indicator film technique (MOIF). The method is applied for mapping the diagram for the La1–xCaxMnO3 colossal magneto-resistive oxide, using the spread films deposited on a SrTiO3 substrate. The constructed magnetic diagram is in a good agreement with data on uniform films and bulk crystals of this system. The MOIF study of transitions under cooling and heating has revealed the formation of a non-magnetic phase in the area of temperatures from 5 K to 57 K and compositions from x = 0 to x = 0.5.

(Received April 29 2004)

(Accepted June 09 2004)

Key Words:

  • Combinatorial synthesis;
  • Deposition (PLD);
  • Magnetic properties

Correspondence:

c1 Address all correspondence to this author. e-mail: leoben@nist.gov

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