Structural, magnetic, and transport properties of a novel class of ferromagnetic semiconductors: Sr M2±xRu 4±xO11(M=Fe,Co)

L. Shlyk, L. E. De Long, S. Kryukov, B. Schüpp-Niewa, R. Niewa

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


A major obstacle to the implementation of spin-polarized semiconductor devices is the current absence of suitable room-temperature, soft ferromagnetic semiconductors (FSs). Dilute magnetic semiconductors are under intense study for applications in spintronics. However, the weak solubility of randomly placed magnetic ions in the semiconductor host makes these materials unsuitable for devices. It is, therefore, crucial to develop a room-temperature FS based on a periodic array of magnetic ions. We have found that ternary ruthenium ferrites exhibit long-range ferromagnetic order well above room temperature, accompanied by narrow-gap semiconducting properties that include a large anomalous Hall conductance, low resistivity, and high carrier concentration. The physical properties can be tuned by simple chemical substitution of two elements, Fe and Co, or by varying the relative concentration of 3d and 4d elements within a homogeneity range that we have established. These promising properties-manifest within a single structural family-provide a fertile ground for fundamental studies and open up a host of potential device applications.

Original languageEnglish
Article number07D112
JournalJournal of Applied Physics
Issue number7
StatePublished - 2008

Bibliographical note

Funding Information:
Research at the University of Kentucky was supported by U.S. Department of Energy Grant No. DE-FG02-97ER45653.

ASJC Scopus subject areas

  • General Physics and Astronomy


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