Iowa Code § 630.18: Lien created.

In the case contemplated in sections 630.16 and 630.17, a lien shall be created on the property of the judgment debtor, or the debtor’s interest therein, in the hands of any defendant or under the defendant’s control, which is sufficiently described in the petition, from the time of the service of notice and copy of the petition on the defendant holding or controlling such property or any interest therein.