Open access (free) articles in physics and related fields. Browse by area of focus listed on main page or search using online form (Tip: Default search is by Author. Change to Full Record to search by keyword.).
Provides citations, abstracts, and limited full-text. While a UNI student, use the UNI Google Scholar link, which links to full-text/Interlibrary Loan services.
Institutional Repositories
Many colleges/universities have online repositories that house articles and other works by faculty & students. These are usually run by the campus library system. If you find an article citation, determine the main author's home institution and search the school website for a repository. Then you can search by author name or article title.