Co (Cobalt)

Metals and conductors

3 datasets, together covering 0.01759–2.48 µm. Default: Johnson and Christy 1974: n,k 0.188–1.937 µm.

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Datasets

Experimental data

Models and simulations

Werner et al. 2009: DFT calculations; n,k 0.0176–2.48 µm n,k 0.01759–2.48 µm

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# Co (Cobalt): Johnson and Christy 1974: n,k 0.188–1.937 µm
co = ls.fetch_refractiveindex("main", "Co", "Johnson", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(co.range_nm)  # (188, 1937) nm
eps = co.eps([633])  # complex permittivity

Downloads the original record once (pinned to the imported snapshot) and caches it.

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_bc028358841b/lightsmith"
co = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(co.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (co/johnson-christy-1974).

# ... load co as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=co)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=1000, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength

Same spec runs with DDA, FDTD, BEM or T-matrix: ls.compare(sim, ["mie", "dda"]).

Materials guide Open a sphere of it in Studio Quick start Ask the community

Lightsmith is open source (MIT): Mie, T-matrix, BEM, DDA, FDTD, RCWA, TMM, mode solvers and inverse design behind one spec, on CPU or GPU. GitHub.

About Co (Cobalt)

Cobalt (Co) is a hard, lustrous, silver-gray metal found in the Earth's crust and commonly obtained as a byproduct of nickel and copper mining. It has a face-centered cubic crystal structure and is known for its high melting point, good thermal conductivity, and magnetic properties. Cobalt is widely used in a variety of applications including superalloys for jet engines and gas turbines, permanent magnets, and rechargeable batteries. Cobalt-based blue pigments have also been historically significant for ceramics and glass. On a smaller scale, but of considerable technological interest, cobalt is also used as a dopant in semiconductors and in certain types of stainless steel. From an environmental standpoint, cobalt can be toxic in high concentrations, necessitating safe handling and disposal practices. Recently, cobalt has gained significant attention for its role in lithium-ion batteries, leading to efforts for ethical sourcing and recycling due to human rights concerns related to its mining. In summary, cobalt is a versatile metal essential for modern technology, whose complex supply chain has made it a focus of ongoing sustainability and human rights initiatives.

Other names: Cobalt

API: /v1/materials/mat_51356cbf15ba · slug co