While maybe not directly tied to memory, the amygdala might be a good place to start. 

http://www.jneurosci.org/content/35/8/3470.long

@ Jacob Huffman, Thank you very much.

I agree with the previous comment. More specifically, you can divide and start with Central amygdala (CA) and Basal lateral amygdala (BLA). Among other parts, these two regions of amygdala plays crucial role in learning and memory.

Md. Moniruzzaman, I am looking for evidence.

Hello,

Please follow the links below. The first paper is about the roles of BLA on long-term memory formation and the second one is about the roles of amygdala on hippocampal memory storage.

http://www.pnas.org/content/93/24/13508.full.pdf

http://www.psych.nyu.edu/phelpslab/papers/04_CON_V14.pdf

Thanks Md. Moniruzzaman. Great help.

No worries. Best of luck.