Ferromagnetic and antiferromagnetic coupling in amorphous (Ni/sub 100-c/Mn/sub c/)/sub 78/P/sub 14/B/sub 8/. [C=0. 7 to 20 at. % 1. 7 to 270/sup 0/K]

Technical Report · Tue Nov 30 23:00:00 EST 1976

DOI:https://doi.org/10.2172/7220151· OSTI ID:7220151

Amamou, A.

The magnetic properties of amorphous alloys (Ni/sub 100-c/Mn/sub c/)/sub 78/P/sub 14/B/sub 8/ with 0.7 at. percent equal to or less than c equal to or less than 20 at. percent were investigated for temperatures between 1.7 and 270/sup 0/K. Samples were prepared by the splat cooling method; the susceptibilities at zero field and the magnetizations in fields up to 70 kOe were measured. Ni/sub 78/P/sub 14/B/sub 8/ is paramagnetic, and Ni--Mn--P--B alloys exhibit different magnetic characteristics depending on the manganese concentration and the temperature range. At ''high temperature'' T equal to or greater than 30/sup 0/K the initial susceptibility has a Curie--Weiss behavior; all the paramagnetic Curie temperatures, theta, are equal to zero or positive. The low-temperature studies show that three concentration regimes can be determined; for c equal to or less than 2 at. percent, a dilute alloy behavior is observed. For higher manganese concentrations the magnetization features show the existence of a mixing of ferromagnetic and antiferromagnetic coupling between atoms. For 2 at. percent less than c equal to or less than 8 at. percent the alloys present spin glass characteristics, i.e., a random magnetic coupling occurs between magnetic moments. For 8 at. percent less than c equal to or less than 20 at. percent the alloys are micromagnetic and show a trend toward an antiferromagnetic order; irreversible phenomena are observed. In this paper the experimental results are interpreted and discussed in relation with the spin glass and micromagnetic models. 5 figures.

• Research Organization: California Inst. of Tech., Pasadena (USA). W.M. Keck Lab. of Engineering Materials
• OSTI ID: 7220151
• Report Number(s): CALT-822-91
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ALLOYS
AMORPHOUS STATE
ANTIFERROMAGNETISM
BORIDES
BORON COMPOUNDS
COUPLING
CURIE POINT
CURIE-WEISS LAW
DILUTE ALLOYS
FERROMAGNETISM
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MAGNETISM
MAGNETIZATION
MANGANESE ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
PHOSPHIDES
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
QUANTITY RATIO
QUATERNARY ALLOY SYSTEMS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE