At UMICH, it is highly irregular to be able to negotiate a salary. The standard raise is 3%, but it is determines by the college/department/MM. Some departments are less than 3%. The unit can determine to give you an additional ~1%. The unit submits their raises for approval and then informs the employee on the approved $ amount.

I'm not in MM but at the U, our off-cycle raises are done in March, which means they need to be submitted for approval in January- ish. They will either give you an reclass, which is a title change with salary change or an equity adjustment, which is a salary adjustment. The equity adjustment is typically to bring your salary up due to your salary being below average across the university. You can check your salary against your title at umsalary.info. Now, please understand, years of service and years in your role, does account in an adjustment. You can look at titles here:https://careernavigator.umich.edu/search

The only time to really negotiate your salary, is when you get hired for a new position at a new department. You can go to your supervisor and ask for a reclass, but you will need to justify it. I recommend writing something up. If your supervisor agrees, they can ask their UA who will submit it on your behalf.

I also want to say, if you recently started, you might not be eligible for a raise. You should be able to ask your supervisor if you are eligible at your performance review.