freeze (someone or something) in (someone's) memory
To maintain someone or something in one's memory. I could never forget what it felt like to hold my baby for the first time—I froze that moment in my memory.
freeze someone or something in one's memory
Fig. to preserve the image of someone or something in one's memory. I tried to freeze her in my memory so I would have her with me always. I froze the scene in my memory.