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All sourcesNASA NTRSDOE OSTI
NASA NTRS1974

Investigation of the growth of garnet films by liquid phase epitaxy

Liquid phase expitaxy was investigated to determine its applicability to fabricating magnetic rare earth garnet films for spacecraft data recording systems. Two mixed garnet systems were investigated in detail: (1) Gd-Y and (2) Eu-Yb-Y. All films were deposited on Gd3Ga5012 substrates. The uniaxial anisotropy of the Gd-Y garnets is primarily stress-induced. These garnets are characterized by high-domain wall mobility, low coercivity and modest anisotropy. Characteristic length was found to be relatively sensitive to temperature. The Eu-Yb-Y garnets exhibit acceptable mobilities, good temperature stability and reasonable quality factors. The uniaxial anisotropy of these garnets is primarily growth-induced. The system is well suited for compositional "tailoring" to optimize specific desirable properties. Liquid phase epitaxy can be used to deposit Gd3Ga5012 spacing layers on magnetic garnet films and this arrangement possesses certain advantages over more conventional magnetic filmspacing layer combinations. However, it cannot be used if the magnetic film is to be ion implanted.

Moody, J. W.↗
DOE OSTI2020

Materials Data on Gd3I by Materials Project

Gd3I is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Gd is bonded in a distorted square co-planar geometry to four equivalent I atoms. All Gd–I bond lengths are 3.51 Å. I is bonded to twelve equivalent Gd atoms to form a mixture of face and corner-sharing IGd12 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Gd3Y by Materials Project

Gd3Y is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Gd is bonded to eight equivalent Gd and four equivalent Y atoms to form GdGd8Y4 cuboctahedra that share corners with twelve equivalent GdGd8Y4 cuboctahedra, edges with eight equivalent YGd12 cuboctahedra, edges with sixteen equivalent GdGd8Y4 cuboctahedra, faces with four equivalent YGd12 cuboctahedra, and faces with fourteen equivalent GdGd8Y4 cuboctahedra. All Gd–Gd bond lengths are 3.57 Å. All Gd–Y bond lengths are 3.57 Å. Y is bonded to twelve equivalent Gd atoms to form YGd12 cuboctahedra that share corners with twelve equivalent YGd12 cuboctahedra, edges with twenty-four equivalent GdGd8Y4 cuboctahedra, faces with six equivalent YGd12 cuboctahedra, and faces with twelve equivalent GdGd8Y4 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on GdY3 by Materials Project

GdY3 is alpha La-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Gd is bonded to twelve Y atoms to form GdY12 cuboctahedra that share corners with four equivalent GdY12 cuboctahedra, corners with eight equivalent YGd4Y8 cuboctahedra, edges with eight equivalent GdY12 cuboctahedra, edges with sixteen equivalent YGd4Y8 cuboctahedra, faces with four equivalent GdY12 cuboctahedra, and faces with fourteen YGd4Y8 cuboctahedra. All Gd–Y bond lengths are 3.59 Å. There are two inequivalent Y sites. In the first Y site, Y is bonded to four equivalent Gd and eight Y atoms to form YGd4Y8 cuboctahedra that share corners with twelve equivalent YGd4Y8 cuboctahedra, edges with eight equivalent GdY12 cuboctahedra, edges with sixteen YGd4Y8 cuboctahedra, faces with four equivalent GdY12 cuboctahedra, and faces with fourteen YGd4Y8 cuboctahedra. All Y–Y bond lengths are 3.59 Å. In the second Y site, Y is bonded to four equivalent Gd and eight equivalent Y atoms to form YGd4Y8 cuboctahedra that share corners with four equivalent YGd4Y8 cuboctahedra, corners with eight equivalent GdY12 cuboctahedra, edges with twenty-four YGd4Y8 cuboctahedra, faces with six equivalent GdY12 cuboctahedra, and faces with twelve YGd4Y8 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on GdY3 by Materials Project

GdY3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Gd is bonded to twelve equivalent Y atoms to form GdY12 cuboctahedra that share corners with twelve equivalent GdY12 cuboctahedra, edges with twenty-four equivalent YGd4Y8 cuboctahedra, faces with six equivalent GdY12 cuboctahedra, and faces with twelve equivalent YGd4Y8 cuboctahedra. All Gd–Y bond lengths are 3.60 Å. Y is bonded to four equivalent Gd and eight equivalent Y atoms to form YGd4Y8 cuboctahedra that share corners with twelve equivalent YGd4Y8 cuboctahedra, edges with eight equivalent GdY12 cuboctahedra, edges with sixteen equivalent YGd4Y8 cuboctahedra, faces with four equivalent GdY12 cuboctahedra, and faces with fourteen equivalent YGd4Y8 cuboctahedra. All Y–Y bond lengths are 3.60 Å.

36 MATERIALS SCIENCE↗