REMANENT MAGNETIZATION IN THE DILUTED ISING ANTIFERROMAGNET FE0.6ZN0.4F2

• The field, H less-than-or-equal-to 5 T, and temperature, T greater-than-or-equal-to 2 K, dependence of the remanent magnetization mu of the diluted Ising antiferromagnet Fe0.6Zn0.4F2 has been investigated utilizing a superconducting quantum interference device magnetometer. The results at low temperatures, where there is no growth of random field domains after the field removal, are analyzed according to mu = AH(x)(T ln t/t0)-PSI + B, where the two terms are domain wall and volume contributions to the remanent magnetization, respectively. It is found that PSI decreases continuously with decreasing temperature, and reaches a value of almost-equal-to 0.15 at 3 K. The field exponent x is found to decrease with increasing temperature, attaining values between 2 and 3. The results show a more complex behavior of the low-temperature remanent magnetization than a model proposed by Nattermann and Vilfan which predicts constant values of the exponents: PSI almost-equal-to 0.4 and x almost-equal-to 2.

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NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

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