For a professional, more important than a raise (they won't admit obviously) is the resources/tools to increase work efficiencydo a good job. Invest in things that will make them more productive, find the chores and try to minimize them. Example of chores that would make people happy if removed/reduced:
- long chain of approvals for simple requests
- slow computers
- too hot or too cold rooms
- outside noise
- printers not working / replacement of tonnertoner taking too long
- etc.
In short, everything that is not really important should not take time or interfere with what is important, so one of the more important jobs of a HoD is to remove the stones in the path of who is working.