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Magnetization reversal phenomena in (Cr0.70Ti0.30)5S6.
- Source :
- Journal of Applied Physics; 12/15/2005, Vol. 98 Issue 12, p123903, 8p, 2 Diagrams, 11 Graphs
- Publication Year :
- 2005
-
Abstract
- Magnetization reversal phenomena (MRP) along magnetic order-order transitions have recently been reported on impurity-doped magnetic systems. Because imperfect long-range magnetic order exists in these systems, it is expected that a systematic investigation of MRP will give physical information on thermomagnetic processes of magnetic systems in the range from the micro- to nanoscales. As a typical order-order transition (a state doubly modulated by helical and canting orders to a collinear ferrimagnetic state) has been known to occur on Cr<subscript>5</subscript>S<subscript>6</subscript> at a transition temperature T<subscript>t</subscript>, we investigate the magnetizations of (Cr<subscript>0.70</subscript>Ti<subscript>0.30</subscript>)<subscript>5</subscript>S<subscript>6</subscript> on heating and cooling runs in various magnetic fields. At 20 Oe, the field-cooled magnetization just below the Curie temperature has a positive sign; the sign turns negative below the compensation temperature T<subscript>CM</subscript> (first step) and finally returns to positive below T<subscript>t</subscript> (second step). The first-step MRP observed in this system is explained by the potential barriers resulting from anisotropy energy when the preferred direction of collinear ferrimagnetic moment reverses. The proposed mechanism for second-step MRP is the pinning effect caused by the impurity atoms (Ti) in the helical long-range-order chains. Comparing other examples of MRPs, we discuss the roles of local impurity centers in the thermomagnetic process in magnetic order-order transitions. [ABSTRACT FROM AUTHOR]
- Subjects :
- MAGNETIZATION
CHROMIUM alloys
FERROMAGNETISM
MAGNETISM
PARAMAGNETISM
THERMOMAGNETISM
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 98
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 19355509
- Full Text :
- https://doi.org/10.1063/1.2148624