THERMAL-EQUILIBRIUM NOISE WITH 1/F SPECTRUM AND TEMPERATURE-DEPENDENT MAGNETIC VISCOSITY IN THE AMORPHOUS ALLOY DYNI

被引：5

作者：

BARBARA, B

RATNAM, A

CAVALLERI, A

CERDONIO, M

VITALE, S

机构：

[1] CNR,ITC,CTR FIS STATI,I-38050 TRENT,ITALY

[2] UNIV TRENT,DEPT PHYS,I-38050 TRENT,ITALY

来源：

JOURNAL OF APPLIED PHYSICS | 1994年 / 75卷 / 10期

关键词：

D O I：

10.1063/1.355617

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on the magnetization noise and the imaginary susceptibility for the random anisotropy amorphous alloy DyNi1.32 for frequencies f < 10 Hz, temperatures 1.2 < T < 4.2 K, and excitation field amplitudes < 150 muA/m (1.9 muOe). The noise spectra agree, without any adjustable parameter, with the fluctuation dissipation formula and the measured imaginary susceptibility of the material. The spectra show a 1/f shape coming from a frequency-independent imaginary susceptibility that it is found to be temperature-dependent extrapolating to zero at zero temperature. We discuss the connection between this approach and the usual relaxation experiments.

引用

页码：5634 / 5636

页数：3

共 13 条

[1]

AWSHALOM DD, 1992, SCIENCE, V258, P414

[2] QUANTUM TUNNELING IN MAGNETIC SYSTEMS OF VARIOUS SIZES (INVITED) [J].

BARBARA, B ;

SAMPAIO, LC ;

WEGROWE, JE ;

RATNAM, BA ;

MARCHAND, A ;

PAULSEN, C ;

NOVAK, MA ;

THOLENCE, JL ;

UEHARA, M ;

FRUCHART, D .

JOURNAL OF APPLIED PHYSICS, 1993, 73 (10) :6703-6708

[3]

BARBARA B, 1990, 1990 P INT WORKSH MA

[4]

CERDONIO M, 1990, PHYSICA B, V165, P65, DOI 10.1016/S0921-4526(90)80882-J

[5] EVALUATION OF THE LOCAL ANISOTROPY TO EXCHANGE RATIO D/J IN AMORPHOUS DYXGD1-XNI [J].

FILIPPI, J ;

DIENY, B ;

BARBARA, B .

SOLID STATE COMMUNICATIONS, 1985, 53 (06) :523-527

[6]

OCIO M, 1985, J PHYS LETT-PARIS, V46, pL647, DOI 10.1051/jphyslet:019850046014064700

[7] THERMAL MAGNETIZATION NOISE AS A FUNCTION OF FREQUENCY IN AMORPHOUS FERROMAGNETS [J].

PRODI, GA ;

VITALE, S ;

CERDONIO, M ;

FALFERI, P .

JOURNAL OF APPLIED PHYSICS, 1989, 66 (12) :5984-5987

[8] QUANTUM TUNNELING OF MAGNETIZATION IN SOLIDS [J].

STAMP, PCE ;

CHUDNOVSKY, EM ;

BARBARA, B .

INTERNATIONAL JOURNAL OF MODERN PHYSICS B, 1992, 6 (09) :1355-1473

[9] A STUDY OF MAGNETIC VISCOSITY [J].

STREET, R ;

WOOLLEY, JC .

PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON SECTION A, 1949, 62 (357) :562-572

[10] MAGNETIC VISCOSITY, THERMAL RELAXATION, AND THERMAL-EQUILIBRIUM NOISE IN CO-BASED AMORPHOUS-ALLOYS AT MILLIKELVIN TEMPERATURES [J].

VITALE, S ;

TOMMASINI, R ;

CERDONIO, M ;

BONALDI, M ;

CAVALLERI, A ;

DURIN, G .

JOURNAL OF APPLIED PHYSICS, 1992, 72 (10) :4820-4825

← 1 2 →