Are university salaries public information in Sweden?
Yes, individual salary information at Swedish universities fall under "offentlighetsprincipen" (the principle of public access to official records), unless they are explicitly classified, which would be very rare. (See for example this document from Stockholm university describing how "offentlighetsprincipen" applies to university matters.)

The easiest way to obtain them is probably to contact the HR department (personalavdelning) at the university/faculty in question.