Get next entry from an entries field
There is no inherent order or hierarchy between entries in a Channel section.  You could do some janky things to simulate it, but you're probably much better off converting that workArticles section to a Structured section, which does give its entries both order and hierarchy.

In your case, you might not care about the hierarchy, so you can just keep everything on the first level.

Very similar to https://craftcms.com/support/structure-nav#top-level-only

Then, if you need to, you can take advantage of all of the structure specific properties of EntryModel, (level, parent, nextSibling, etc.)