# Controlling Spin-flips of Molecules in an Electromagnetic Trap

## TL;DR

This paper investigates the complex spin dynamics of doubly dipolar molecules in electromagnetic traps, demonstrating control over spin-flip losses to improve trapping and cooling techniques.

## Contribution

It provides a method to tune spin-flip losses in molecules using simple external bias coils, significantly reducing loss rates.

## Key findings

- Spin-flip losses can be tuned from over 200 s⁻¹ to below 2 s⁻¹.
- External bias coils effectively control molecular spin-flip transitions.
- The approach minimally impacts trap depth and gradient.

## Abstract

Doubly dipolar molecules exhibit complex internal spin-dynamics when electric and magnetic fields are both applied. Near magnetic trap minima, these spin-dynamics lead to enhancements in Majorana spin-flip transitions by many orders of magnitude relative to atoms, and are thus an important obstacle for progress in molecule trapping and cooling. We conclusively demonstrate and address this with OH molecules in a trap geometry where spin-flip losses can be tuned from over $200 \text{ s}^{-1} $ to below our $2\text{ s}^{-1}$ vacuum limited loss rate with only a simple external bias coil and with minimal impact on trap depth and gradient.