H-T Phase Diagram of Magnetic Semiconductor Thin Films - Experiment
M. Lubeckaa, L.J. Maksymowicza, R. Szymczakb and W. Powroźnika
aDepartment of Electronics, UM & M, Al. Mickiewicza 30, 30-059 Kraków, Poland
bInstitute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland
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We used the irreversibilities between the field cooled and zero field cooled dc magnetization to determine the field and composition dependence of the spin-glass freezing temperature in CdCr2Se4 : In (REE) and CdCr2-2xIn2xSe4 (0.15 ≤ x ≤ 0.35) (SG) thin films. The H-T phase diagram of samples with REE has two instability lines: the Gabay-Toulouse-type (G-T) and the De Almeida-Thouless-type (A-T) while samples in SG state are characterized by the A-T line. The A-T line of thin films was used for calculation the normalised internal magnetic field hm of infinite spin clusters with long range ordering.
DOI: 10.12693/APhysPolA.92.433
PACS numbers: 64.60.Cn, 75.50.Lk, 75.30.Gw