if you want to navigate between page try use $state.go
like this:
app.controller("RegistrationCtrl", function($scope, $state){
this.goAfter = function(){
$state.go('after');
}
});
In html try use:
< div ng-controller="AfterCtrl as ctrl" class="content" >
< button class="button button-positive" ng-click="ctrl.goAfter()">Go to prev state (page)