Hi it sounds like one of the acer palmatum dissectum atropurpureum family, hopefully there is a link here. But there are lots of varieties of these to choose from one called Crimson Queen which is a popular one.
I have had one of these for years now, originally in big pot and when the frost finally got to that decided to plant it in the ground in the same shady spot which it seems to enjoy.
You do though every end of season get dead branches which I normally trim off in the winter before the new grow arrives. No one really know why this is and normally say its down to wind damage or just a natural progression.
Its worth keeping this variety in away from wind and in a sheltered spot, as the fine dissected leaves do tend to get the worst of it in the summer and shrivel up.
The tree will maintain its umbrella shape throughout its grown and is very slow growing and compact.
I have six Acers in the garden now all of them different and all of them have done exceptionally well even though I am on Chalk soil. Did dig a big hole before I planted them and are looking to reduce the size of a couple this year as they are getting too big.
hope this helps