A permanent magnetic film atom chip for Bose-Einstein condensation

TL;DR

This paper introduces a hybrid atom chip combining permanent magnetic films and microstructures to produce Bose-Einstein condensates, enabling stable magnetic trapping and field profiling for ultracold atoms.

Contribution

It presents a novel magnetic film material and design for atom chips, demonstrating BEC production and magnetic field sensing capabilities.

Findings

Successful creation of BEC using the magnetic film and microstructure

Magnetic field profiling near the magnetic film surface

Potential for stable, miniaturized quantum devices

Abstract

We present a hybrid atom chip which combines a permanent magnetic film with a micromachined current-carrying structure used to realize a Bose-Einstein condensate. A novel TbGdFeCo material with large perpendicular magnetization has been tailored to allow small scale, stable magnetic potentials for ultracold atoms. We are able to produce 87Rb Bose-Einstein condensates in a magnetic trap based on either the permanent magnetic film or the current-carrying structure. Using the condensate as a magnetic field probe we perform cold atom magnetometry to profile both the field magnitude and gradient as a function of distance from the magnetic film surface. Finally we discuss future directions for our permanent magnetic film atom chip.