Usage patterns
〈事〉を覚書に残すto jot something down as a note for future reference
I jotted down the contents of the meeting as a memo.
〈相手〉と覚書を交わすto exchange a memorandum with a party
The two countries exchanged a memorandum on economic cooperation.
覚書に署名するto sign a memorandum
The two leaders signed the memorandum.
〈相手〉と覚書を結ぶto conclude a memorandum of understanding with someone
The company concluded a memorandum of understanding with the local government.