Preparation and stability of NdDyFeCoTi magneto-optical amorphous films

Journal Article · Mon Apr 15 00:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347789· OSTI ID:5694761

Zhang, S J; Li, X L; Yang, X Y; Zhang, F P ^[1]

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1. Southwest Institute of Applied Magnetics, Mianyang 621000, China (CN)

Because the light rare-earth element Nd makes a significant contribution to the Kerr effect and the heavy rare-earth element Dy can improve the coercivity and perpendicular anisotropy, NdDyFeCoTi magneto-optical material was studied. The alloy targets were prepared by a vacuumm melting method with compositions (Nd{sub {ital x}}Dy{sub 1{minus}{ital x}}){sub 25}(Fe{sub 0.65}Co{sub 0.30}Ti{sub 0.05}){sub 75} with {ital x}=0.2--0.3. Because of the addition of Ti, the mechanical strength of the target was improved. Amorphous NdDyFeCoTi films were prepared by rf magnetron sputtering onto glass substrates at zero bias, a low Ar pressure of 3--7 mTorr, and a low-input sputtering power of 100--300 W. The magnetic and magneto-optical properties of these films were studied by VSM, Kerr hysteresis tracer, and Auger electron spectroscopy. The Kerr angle {theta}{sub {ital k}} of 0.3{degree} and the coercive force {ital H}{sub {ital c}} of 3--5 kOe have been found. The stability of the films was examined by exposure in air for one month and annealing at 100--250 {degree}C. The magneto-optical properties of the films exhibit no obvious change after exposure in air, but after annealing at 200--250 {degree}C the properties of NdDyFeCoTi with a SiO{sub 2} protective layer became poor. As a result, it is necessary to improve the stability of NdDyFeCoTi magneto-optical films by a protective layer without oxygen such as AlN.

• OSTI ID: 5694761
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:8; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
AMORPHOUS STATE
ANISOTROPY
AUGER ELECTRON SPECTROSCOPY
COBALT ALLOYS
COERCIVE FORCE
COHERENT SCATTERING
DIFFRACTION
DYSPROSIUM ALLOYS
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
FILMS
IRON ALLOYS
MAGNETIC PROPERTIES
MAGNETO-OPTICAL EFFECTS
MICROSCOPY
NEODYMIUM ALLOYS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SCANNING ELECTRON MICROSCOPY
SCATTERING
SPECTROSCOPY
SPUTTERING
THIN FILMS
TITANIUM ALLOYS
X-RAY DIFFRACTION