Magnetic properties and critical phenomena in rare-earth-transition metal glasses

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1990

OSTI ID:5346012

Lee, Kwan Myung

This work studied the effects of random anisotropy on the magnetic properties and critical phenomena in ferromagnetic systems. Many of the alloys studied are based on rapidly quenched amorphous Gd{sub 65}Co{sub 35} which is ferromagnetic-like and random anisotropy is induced by substituting the anisotropic rare earths (R) Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Yb according to the formula R{sub x}Gd{sub 65{minus}x}Co{sub 35}. Nonmagnetic rare earths La and Ce are also substituted for comparison. Er, which has the weakest anisotropy of all the anisotropic rare earths, produces a cross-over to paramagnetic (PM)-ferromagnetic (FM)-speromagnetic (SM) behavior with decreasing temperature, often called double-transition behavior. All of the stronger anisotropic rare earths produce a cross over to PM-SM behavior with decreasing temperature, implicating the weak anisotropy associated with Er as the cause of the double-transition behavior. Critical phenomena were studied via magnetic scaling, and random anisotropy was found to affect ferromagnetic scaling below fields of about 1 kOe; the author discusses these low-field results in terms of an SM scaling. Some comparative studies were also made of sputtered Tb{sub y} Fe{sub 100{minus}y} alloys.

• Research Organization: Kansas State Univ., Manhattan, KS (United States)
• OSTI ID: 5346012
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ANISOTROPY
COBALT ALLOYS
GADOLINIUM ALLOYS
IRON ALLOYS
MAGNETIC PROPERTIES
METALLIC GLASSES
METALLURGICAL EFFECTS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
TERBIUM ALLOYS