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

Citation
C. Djurberg et al., REMANENT MAGNETIZATION IN THE DILUTED ISING ANTIFERROMAGNET FE0.6ZN0.4F2, Journal of applied physics, 75(10), 1994, pp. 5541-5543
Citations number
10
Categorie Soggetti
Physics, Applied
Journal title
ISSN journal
00218979
Volume
75
Issue
10
Year of publication
1994
Part
2A
Pages
5541 - 5543
Database
ISI
SICI code
0021-8979(1994)75:10<5541:RMITDI>2.0.ZU;2-S
Abstract
The field, H less-than-or-equal-to 5 T, and temperature, T greater-tha n-or-equal-to 2 K, dependence of the remanent magnetization mu of the diluted Ising antiferromagnet Fe0.6Zn0.4F2 has been investigated utili zing a superconducting quantum interference device magnetometer. The r esults at low temperatures, where there is no growth of random field d omains 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 cont ributions to the remanent magnetization, respectively. It is found tha t 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 an d 3. The results show a more complex behavior of the low-temperature r emanent magnetization than a model proposed by Nattermann and Vilfan w hich predicts constant values of the exponents: PSI almost-equal-to 0. 4 and x almost-equal-to 2.