Bismuth Lutetium Iron Gallate sputtering targets from Infinita Materials supply a bismuth- and gallium-substituted lutetium iron garnet, Bi1.5Lu1.5Fe4GaO12, engineered for magneto-optical thin-film deposition. Half of the lutetium dodecahedral sites are replaced with bismuth to amplify Faraday rotation, while gallium substitution on the tetrahedral iron site tempers magnetic saturation and optical loss, giving film designers an independently tunable magneto-optic garnet.
Bismuth Lutetium Iron Gallate (Bi₁.₅Lu₁.₅Fe₄GaO₁₂) is a rare-earth iron garnet with the cubic Ia-3d garnet structure, containing Bi³⁺ and Lu³⁺ on dodecahedral sites and Ga³⁺ partially substituting for Fe³⁺ on tetrahedral sites. The highly polarizable Bi³⁺ ion enhances magneto-optical activity and Faraday rotation, while Ga³⁺ reduces net magnetisation and modifies optical absorption, enabling tuning of magnetic and optical losses. Because heavily Bi-substituted garnets are difficult to obtain as homogeneous bulk crystals, magnetron sputtering from dense ceramic targets provides precise composition and thickness control. RF or pulsed-DC sputtering produces insulating films on silicon, glass, or garnet substrates for integrated optical isolators and circulators, magneto-optic field and current sensors, and magneto-optic imaging systems.
Answer: Bismuth Lutetium Iron Gallate (Bi1.5Lu1.5Fe4GaO12) sputter target is a high-performance material used to sputter thin films with a unique magneto-optic surface property. Its ability to exist with magnetic and optical properties is applied in optical isolators, magnetic field sensors, and spintronics applications.
Answer: Its applications include electronic devices, optoelectronics, photonic systems, ferroelectric memory devices, sensors, and energy harvesting applications.
Answer: High purity is necessary to produce good-quality films. Impurities within the material change the deposited films' electrical, optical, and structural properties.
Answer: Bismuth on the dodecahedral rare-earth site amplifies Faraday rotation, while gallium on the tetrahedral iron site independently lowers saturation magnetization and iron-related optical absorption, letting film designers tune rotation strength and loss separately rather than trading one off against the other.
Bismuth Lutetium Iron Gallate (Bi₁.₅Lu₁.₅Fe₄GaO₁₂) is a rare-earth iron garnet with the cubic Ia-3d garnet structure, containing Bi³⁺ and Lu³⁺ on dodecahedral sites and Ga³⁺ partially substituting for Fe³⁺ on tetrahedral sites. The highly polarizable Bi³⁺ ion enhances magneto-optical activity and Faraday rotation, while Ga³⁺ reduces net magnetisation and modifies optical absorption, enabling tuning of magnetic and optical losses. Because heavily Bi-substituted garnets are difficult to obtain as homogeneous bulk crystals, magnetron sputtering from dense ceramic targets provides precise composition and thickness control. RF or pulsed-DC sputtering produces insulating films on silicon, glass, or garnet substrates for integrated optical isolators and circulators, magneto-optic field and current sensors, and magneto-optic imaging systems.
Key Properties of Bismuth Lutetium Iron Gallate
Property
Value
Significance
Chemical Formula
Bi1.5Lu1.5Fe4GaO12
Defines the half-bismuth-substituted, gallium-diluted garnet stoichiometry that separately tunes Faraday rotation and magnetic saturation
CAS Number
Not established
No distinct CAS registry number exists for this specific Bi- and Ga-substituted garnet composition; it is identified in practice by formula and supplier part number
Purity
99.9% – 99.999%
Higher purity grades reduce trace-metal scattering and optical absorption losses in the deposited magneto-optic film
Molar Mass
~1061.0 g/mol
Calculated from standard atomic weights for the Bi1.5Lu1.5Fe4GaO12 formula unit; used for stoichiometry and deposition-rate calculations
Density (theoretical)
~7.4 g/cm3
Estimated from the garnet unit-cell mass and lattice expansion caused by bismuth substitution relative to unsubstituted lutetium iron garnet; higher sintered target density improves sputter uniformity and reduces arcing
Crystal Structure
Cubic garnet (Ia-3d), R3Fe5O12 type
Same garnet framework as lutetium iron garnet, with bismuth occupying half the dodecahedral rare-earth sites and gallium occupying part of the tetrahedral iron sites
Magnetic / Optical Behaviour
Ferrimagnetic; enhanced Faraday rotation with reduced saturation magnetisation
The bismuth substitution amplifies magneto-optical rotation while the gallium substitution lowers net magnetisation and iron-related optical absorption.
Electrical Resistivity
High (insulating oxide)
Supports stable RF magnetron sputtering and minimises eddy-current losses in the deposited magneto-optic film
Types & Grades of Bismuth Lutetium Iron Gallate
Bismuth Lutetium Iron Gallate targets are offered in standard catalogue sizes and grades, with custom purity, density, and geometry available for OEM and R&D deposition systems.
Grade / Form
Typical Purity
Key Features / Uses
Standard sputtering disc target
99.9%
General-purpose magnetron sputtering for research and process-development magneto-optic films
High-purity target
99.95% – 99.99%
Reduced trace-metal and secondary-phase content for isolator and circulator films where optical absorption must be minimised
Ultra-high-purity target
99.999% and above
Research-grade material for fundamental studies of Faraday rotation and magneto-optic figure of merit in Bi: Lu-Fe-Ga garnet films
Bonded target assembly
99.9% – 99.999%
Indium- or elastomer-bonded to a backing plate for improved thermal management during extended sputtering runs of this brittle ceramic oxide
Custom composition (Bi:Lu:Ga ratio)
99.9% and above
Bismuth loading and gallium content adjustable around the Bi1.5Lu1.5Fe4Ga baseline to trade off Faraday rotation strength against magnetic saturation and optical loss for a specific device design
Applications of Bismuth Lutetium Iron Gallate
Sputtered films of Bismuth Lutetium Iron Gallate support demanding roles across research and production applications where this material’s specific structural, electronic, or optical properties are the key requirement.
Industry
Application
Function
Integrated photonics
On-chip optical isolator and circulator films
Provides large, non-reciprocal Faraday rotation combined with low optical loss for blocking back-reflected light in planar waveguide isolators
Telecommunications
Magneto-optic isolator coatings for laser modules and transceivers
Protects laser sources from destabilising back-reflections in fibre-optic and free-space telecom links
Magnetic and current sensing
Magneto-optic field and current sensors
Faraday rotation response to applied magnetic field enables optical readout of magnetic fields without direct electrical contact.
Magneto-optic imaging
Domain and current imaging films
High Faraday rotation combined with reduced magnetisation gives sharp, high-contrast visualisation of local magnetic fields.
Photonic crystal and metasurface research
Non-reciprocal photonic device layers
Tunable magneto-optic response supports magnetophotonic crystal and metasurface designs requiring precise loss and rotation control.
Reference target material for growing epitaxial and polycrystalline Bi: Lu-Fe-Ga garnet films on garnet, silicon, or glass substrates
Why Partner with Infinita Materials?
Technical Depth: in-house quality control with ICP-MS and XRF purity verification, density measurement, and full certificates of analysis on every target.
Global Logistics: reliable supply from single R&D-scale targets to production-line volumes, with established international shipping.
Responsive Support: direct access to materials engineers for grade, bonding, and geometry selection, and process-compatibility questions.
Take the Next Step
Infinita Materials fabricates Bismuth Lutetium Iron Gallate sputtering targets engineered to the purity, density, and geometry your deposition process requires. Whether the requirement is a standard catalogue target or a custom size, purity, or bonded assembly, our team can help match the right specification to your deposition system. Request a quote or speak with our technical team to discuss your target specification.
Other Related Product to Bismuth Lutetium Iron Gallate
Bismuth Lutetium Iron Gallate (Bi1.5Lu1.5Fe4GaO12) sputter target is a high-performance material used to sputter thin films with a unique magneto-optic surface property. Its ability to exist with magnetic and optical properties is applied in optical isolators, magnetic field sensors, and spintronics applications.
Its applications include electronic devices, optoelectronics, photonic systems, ferroelectric memory devices, sensors, and energy harvesting applications.
High purity is necessary to produce good-quality films. Impurities within the material change the deposited films' electrical, optical, and structural properties.
Bismuth on the dodecahedral rare-earth site amplifies Faraday rotation, while gallium on the tetrahedral iron site independently lowers saturation magnetization and iron-related optical absorption, letting film designers tune rotation strength and loss separately rather than trading one off against the other.
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