<md-input-container class="md-icon-float md-block" style="position: relative;" flex="100" flex-sm="100" flex-gt-sm="50" flex-gt-md="50">
<!-- Use floating label instead of placeholder -->
<label>Búsqueda</label>
<input ng-model="criterioBusqueda" type="text">
<md-button class="md-fab md-mini md-primary" aria-label="Buscar" style="right:-7px;position:absolute" ng-click="estado=1;cargarFacturas(criterioBusqueda)">
<md-tooltip>Buscar</md-tooltip>
<i class="fa fa-search" aria-hidden="true"></i>
</md-button>
</md-input-container>