Ferromagnetic resonance and magnetic homogeneity in a giant-magnetoresistance material La23Ba13MnO3

S. E. Lofland, S. M. Bhagat, Honglyoul Ju, G. C. Xiong, T. Venkatesan, R. L. Greene

Research output: Contribution to journalArticle

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Abstract

Systematic magnetization, resistivity, and ferromagnetic resonance measurements have been done on bulk as well as thin-film samples of La23Ba13MnO3. Bulk specimens and as-grown films show broad lines whose width increases to nearly 1 kOe as T is reduced to 77 K. At low T, the bulk magnetization is as expected for fully aligned spins [4πM(0)=7.2 kOe]. As-grown films, however, show somewhat smaller values. The main finding is that films which have been annealed for several days at 1000 °C in an atmosphere of O2 exhibit narrow (∼200 Oe at 10 GHz) linewidths which are effectively independent of temperature. These are, to our knowledge, the narrowest lines observed in giant magnetoresistance materials, a strong indication of homogeneity. The low-T magnetization is near the expected value, and its temperature dependence is highly suggestive of low-lying spin-wave excitations.

Original languageEnglish
Pages (from-to)15058-15061
Number of pages4
JournalPhysical Review B
Volume52
Issue number21
DOIs
Publication statusPublished - 1995 Jan 1

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ferromagnetic resonance
homogeneity
magnetization
wave excitation
magnons
indication
atmospheres
temperature dependence
electrical resistivity
thin films
temperature

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Lofland, S. E., Bhagat, S. M., Ju, H., Xiong, G. C., Venkatesan, T., & Greene, R. L. (1995). Ferromagnetic resonance and magnetic homogeneity in a giant-magnetoresistance material La23Ba13MnO3. Physical Review B, 52(21), 15058-15061. https://doi.org/10.1103/PhysRevB.52.15058
Lofland, S. E. ; Bhagat, S. M. ; Ju, Honglyoul ; Xiong, G. C. ; Venkatesan, T. ; Greene, R. L. / Ferromagnetic resonance and magnetic homogeneity in a giant-magnetoresistance material La23Ba13MnO3. In: Physical Review B. 1995 ; Vol. 52, No. 21. pp. 15058-15061.
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Ferromagnetic resonance and magnetic homogeneity in a giant-magnetoresistance material La23Ba13MnO3. / Lofland, S. E.; Bhagat, S. M.; Ju, Honglyoul; Xiong, G. C.; Venkatesan, T.; Greene, R. L.

In: Physical Review B, Vol. 52, No. 21, 01.01.1995, p. 15058-15061.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Ferromagnetic resonance and magnetic homogeneity in a giant-magnetoresistance material La23Ba13MnO3

AU - Lofland, S. E.

AU - Bhagat, S. M.

AU - Ju, Honglyoul

AU - Xiong, G. C.

AU - Venkatesan, T.

AU - Greene, R. L.

PY - 1995/1/1

Y1 - 1995/1/1

N2 - Systematic magnetization, resistivity, and ferromagnetic resonance measurements have been done on bulk as well as thin-film samples of La23Ba13MnO3. Bulk specimens and as-grown films show broad lines whose width increases to nearly 1 kOe as T is reduced to 77 K. At low T, the bulk magnetization is as expected for fully aligned spins [4πM(0)=7.2 kOe]. As-grown films, however, show somewhat smaller values. The main finding is that films which have been annealed for several days at 1000 °C in an atmosphere of O2 exhibit narrow (∼200 Oe at 10 GHz) linewidths which are effectively independent of temperature. These are, to our knowledge, the narrowest lines observed in giant magnetoresistance materials, a strong indication of homogeneity. The low-T magnetization is near the expected value, and its temperature dependence is highly suggestive of low-lying spin-wave excitations.

AB - Systematic magnetization, resistivity, and ferromagnetic resonance measurements have been done on bulk as well as thin-film samples of La23Ba13MnO3. Bulk specimens and as-grown films show broad lines whose width increases to nearly 1 kOe as T is reduced to 77 K. At low T, the bulk magnetization is as expected for fully aligned spins [4πM(0)=7.2 kOe]. As-grown films, however, show somewhat smaller values. The main finding is that films which have been annealed for several days at 1000 °C in an atmosphere of O2 exhibit narrow (∼200 Oe at 10 GHz) linewidths which are effectively independent of temperature. These are, to our knowledge, the narrowest lines observed in giant magnetoresistance materials, a strong indication of homogeneity. The low-T magnetization is near the expected value, and its temperature dependence is highly suggestive of low-lying spin-wave excitations.

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